Visit this site (http://openstaxcollege.org/l/heartvalve) to observe an echocardiogram of actual heart valves opening and closing. Although much of the heart has been “removed” from this gif loop so the chordae tendineae are not visible, why is their presence more critical for the atrioventricular valves (tricuspid and mitral) than the semilunar (aortic and pulmonary) valves?

Question

Want to see more full solutions like this?

Answer 1

Textbook Question

Chapter 19, Problem 1ILQ

Visit this site (http://openstaxcollege.org/l/heartvalve) to observe an echocardiogram of actual heart valves opening and closing. Although much of the heart has been “removed” from this gif loop so the chordae tendineae are not visible, why is their presence more critical for the atrioventricular valves (tricuspid and mitral) than the semilunar (aortic and pulmonary) valves?

Expert Solution & Answer

Summary Introduction

To analyze:

Why the presence of chordae tendineae is more critical for the atrioventricular valves than semilunar valves.

Introduction:

Chordae tendineae also called the heartstrings are closely associated with the papillary muscles of the atrioventricular valves. The semilunar valves, however, lack them.

Explanation of Solution

The atrioventricular valves are situated between the auricles and ventricles − the tricuspid valve between the right auricle and the right ventricle while the mitral or bicuspid valve between the left auricle and the left ventricle. They have papillary muscles attached to them. The chordae tendineae are string-like tendons which connect these valves to the papillary muscles.

During the pumping action of the heart, immense intraventricular pressure is created during systole or ventricular contraction. The atrioventricular valves shut their cusps to ensure no backflow of blood occurs from the ventricles to the auricles. The chordae tendineae play a vital role in holding the cusps of these valves in place and preventing the prolapsing of the mitral and tricuspid valves.

If we talk of the semilunar valves, their role to avoid back flow of blood is at the sites and situations where the pressure of the blood is lower compared to the atrioventricular valves. The pulmonary valve is present at the junction of the right ventricle and the pulmonary trunk. The aortic valve is present at the junction of the left ventricle and the aorta.

During the ventricular systole when the pressure in ventricles becomes greater than the pulmonary artery or the aorta these valves open an allow blood to flow though them. When the pressure in the ventricles decreases during diastole, these valves close on their own. Since their closure is directly associated with the lower pressure of blood they do not require strong tendons like chordae tendineae to keep them in position.

Conclusion

The mechanism and role of the closing of atrioventricular valves and the semilunar valves are directly related to the intraventricular pressure during the pumping action of the heart. During systole, when intra ventricular pressure is high the bicuspid and tricuspid valves close while the semilunar valves open. During diastole or low intraventricular pressure, the situation is reversed. Hence, the presence of chordae tendineae is more critical of atrioventricular valves than the semilunar valves.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Students have asked these similar questions

The four-chambered heart is a single organ but is sometimes described as a “double pump” because it functions more like two pumps than one. Explain why this is so, including the names of the heart structures involved. please help

A 60-year-old woman receives a coronary angiogram following a myocardial infarction in order to evaluate the condition of her coronary circulation. Most blood draining from the heart wall (myocardium) will return to the heart through which of the following structures? Coronary sinus Superior vena cava Ascending aorta Pulmonary veins Inferior vena cava

Determine whether the statement is either true or false. To clearly hear the heart sound of the bicuspid valve, a stethoscope should be placed to the left of the sternum at the second intercostal space. At late diastole, the atria and ventricles are relaxed and the aortic semilunar valve is open. During ventricular contraction all the blood is forced out of the ventricles.

Answer 2

Textbook Question

Chapter 19, Problem 1ILQ

Visit this site (http://openstaxcollege.org/l/heartvalve) to observe an echocardiogram of actual heart valves opening and closing. Although much of the heart has been “removed” from this gif loop so the chordae tendineae are not visible, why is their presence more critical for the atrioventricular valves (tricuspid and mitral) than the semilunar (aortic and pulmonary) valves?

Expert Solution & Answer

Summary Introduction

To analyze:

Why the presence of chordae tendineae is more critical for the atrioventricular valves than semilunar valves.

Introduction:

Chordae tendineae also called the heartstrings are closely associated with the papillary muscles of the atrioventricular valves. The semilunar valves, however, lack them.

Explanation of Solution

The atrioventricular valves are situated between the auricles and ventricles − the tricuspid valve between the right auricle and the right ventricle while the mitral or bicuspid valve between the left auricle and the left ventricle. They have papillary muscles attached to them. The chordae tendineae are string-like tendons which connect these valves to the papillary muscles.

During the pumping action of the heart, immense intraventricular pressure is created during systole or ventricular contraction. The atrioventricular valves shut their cusps to ensure no backflow of blood occurs from the ventricles to the auricles. The chordae tendineae play a vital role in holding the cusps of these valves in place and preventing the prolapsing of the mitral and tricuspid valves.

If we talk of the semilunar valves, their role to avoid back flow of blood is at the sites and situations where the pressure of the blood is lower compared to the atrioventricular valves. The pulmonary valve is present at the junction of the right ventricle and the pulmonary trunk. The aortic valve is present at the junction of the left ventricle and the aorta.

During the ventricular systole when the pressure in ventricles becomes greater than the pulmonary artery or the aorta these valves open an allow blood to flow though them. When the pressure in the ventricles decreases during diastole, these valves close on their own. Since their closure is directly associated with the lower pressure of blood they do not require strong tendons like chordae tendineae to keep them in position.

Conclusion

The mechanism and role of the closing of atrioventricular valves and the semilunar valves are directly related to the intraventricular pressure during the pumping action of the heart. During systole, when intra ventricular pressure is high the bicuspid and tricuspid valves close while the semilunar valves open. During diastole or low intraventricular pressure, the situation is reversed. Hence, the presence of chordae tendineae is more critical of atrioventricular valves than the semilunar valves.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 3

Textbook Question

Chapter 19, Problem 1ILQ

Visit this site (http://openstaxcollege.org/l/heartvalve) to observe an echocardiogram of actual heart valves opening and closing. Although much of the heart has been “removed” from this gif loop so the chordae tendineae are not visible, why is their presence more critical for the atrioventricular valves (tricuspid and mitral) than the semilunar (aortic and pulmonary) valves?

Expert Solution & Answer

Summary Introduction

To analyze:

Why the presence of chordae tendineae is more critical for the atrioventricular valves than semilunar valves.

Introduction:

Chordae tendineae also called the heartstrings are closely associated with the papillary muscles of the atrioventricular valves. The semilunar valves, however, lack them.

Explanation of Solution

The atrioventricular valves are situated between the auricles and ventricles − the tricuspid valve between the right auricle and the right ventricle while the mitral or bicuspid valve between the left auricle and the left ventricle. They have papillary muscles attached to them. The chordae tendineae are string-like tendons which connect these valves to the papillary muscles.

During the pumping action of the heart, immense intraventricular pressure is created during systole or ventricular contraction. The atrioventricular valves shut their cusps to ensure no backflow of blood occurs from the ventricles to the auricles. The chordae tendineae play a vital role in holding the cusps of these valves in place and preventing the prolapsing of the mitral and tricuspid valves.

If we talk of the semilunar valves, their role to avoid back flow of blood is at the sites and situations where the pressure of the blood is lower compared to the atrioventricular valves. The pulmonary valve is present at the junction of the right ventricle and the pulmonary trunk. The aortic valve is present at the junction of the left ventricle and the aorta.

During the ventricular systole when the pressure in ventricles becomes greater than the pulmonary artery or the aorta these valves open an allow blood to flow though them. When the pressure in the ventricles decreases during diastole, these valves close on their own. Since their closure is directly associated with the lower pressure of blood they do not require strong tendons like chordae tendineae to keep them in position.

Conclusion

The mechanism and role of the closing of atrioventricular valves and the semilunar valves are directly related to the intraventricular pressure during the pumping action of the heart. During systole, when intra ventricular pressure is high the bicuspid and tricuspid valves close while the semilunar valves open. During diastole or low intraventricular pressure, the situation is reversed. Hence, the presence of chordae tendineae is more critical of atrioventricular valves than the semilunar valves.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Textbook Question

Chapter 19, Problem 1ILQ

Visit this site (http://openstaxcollege.org/l/heartvalve) to observe an echocardiogram of actual heart valves opening and closing. Although much of the heart has been “removed” from this gif loop so the chordae tendineae are not visible, why is their presence more critical for the atrioventricular valves (tricuspid and mitral) than the semilunar (aortic and pulmonary) valves?

Expert Solution & Answer

Summary Introduction

To analyze:

Why the presence of chordae tendineae is more critical for the atrioventricular valves than semilunar valves.

Introduction:

Chordae tendineae also called the heartstrings are closely associated with the papillary muscles of the atrioventricular valves. The semilunar valves, however, lack them.

Explanation of Solution

The atrioventricular valves are situated between the auricles and ventricles − the tricuspid valve between the right auricle and the right ventricle while the mitral or bicuspid valve between the left auricle and the left ventricle. They have papillary muscles attached to them. The chordae tendineae are string-like tendons which connect these valves to the papillary muscles.

During the pumping action of the heart, immense intraventricular pressure is created during systole or ventricular contraction. The atrioventricular valves shut their cusps to ensure no backflow of blood occurs from the ventricles to the auricles. The chordae tendineae play a vital role in holding the cusps of these valves in place and preventing the prolapsing of the mitral and tricuspid valves.

If we talk of the semilunar valves, their role to avoid back flow of blood is at the sites and situations where the pressure of the blood is lower compared to the atrioventricular valves. The pulmonary valve is present at the junction of the right ventricle and the pulmonary trunk. The aortic valve is present at the junction of the left ventricle and the aorta.

During the ventricular systole when the pressure in ventricles becomes greater than the pulmonary artery or the aorta these valves open an allow blood to flow though them. When the pressure in the ventricles decreases during diastole, these valves close on their own. Since their closure is directly associated with the lower pressure of blood they do not require strong tendons like chordae tendineae to keep them in position.

Conclusion

The mechanism and role of the closing of atrioventricular valves and the semilunar valves are directly related to the intraventricular pressure during the pumping action of the heart. During systole, when intra ventricular pressure is high the bicuspid and tricuspid valves close while the semilunar valves open. During diastole or low intraventricular pressure, the situation is reversed. Hence, the presence of chordae tendineae is more critical of atrioventricular valves than the semilunar valves.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

Summary Introduction

To analyze:

Why the presence of chordae tendineae is more critical for the atrioventricular valves than semilunar valves.

Introduction:

Chordae tendineae also called the heartstrings are closely associated with the papillary muscles of the atrioventricular valves. The semilunar valves, however, lack them.

Explanation of Solution

The atrioventricular valves are situated between the auricles and ventricles − the tricuspid valve between the right auricle and the right ventricle while the mitral or bicuspid valve between the left auricle and the left ventricle. They have papillary muscles attached to them. The chordae tendineae are string-like tendons which connect these valves to the papillary muscles.

During the pumping action of the heart, immense intraventricular pressure is created during systole or ventricular contraction. The atrioventricular valves shut their cusps to ensure no backflow of blood occurs from the ventricles to the auricles. The chordae tendineae play a vital role in holding the cusps of these valves in place and preventing the prolapsing of the mitral and tricuspid valves.

If we talk of the semilunar valves, their role to avoid back flow of blood is at the sites and situations where the pressure of the blood is lower compared to the atrioventricular valves. The pulmonary valve is present at the junction of the right ventricle and the pulmonary trunk. The aortic valve is present at the junction of the left ventricle and the aorta.

During the ventricular systole when the pressure in ventricles becomes greater than the pulmonary artery or the aorta these valves open an allow blood to flow though them. When the pressure in the ventricles decreases during diastole, these valves close on their own. Since their closure is directly associated with the lower pressure of blood they do not require strong tendons like chordae tendineae to keep them in position.

Conclusion

The mechanism and role of the closing of atrioventricular valves and the semilunar valves are directly related to the intraventricular pressure during the pumping action of the heart. During systole, when intra ventricular pressure is high the bicuspid and tricuspid valves close while the semilunar valves open. During diastole or low intraventricular pressure, the situation is reversed. Hence, the presence of chordae tendineae is more critical of atrioventricular valves than the semilunar valves.

Answer 8

Expert Solution & Answer

Summary Introduction

To analyze:

Why the presence of chordae tendineae is more critical for the atrioventricular valves than semilunar valves.

Introduction:

Chordae tendineae also called the heartstrings are closely associated with the papillary muscles of the atrioventricular valves. The semilunar valves, however, lack them.

Explanation of Solution

The atrioventricular valves are situated between the auricles and ventricles − the tricuspid valve between the right auricle and the right ventricle while the mitral or bicuspid valve between the left auricle and the left ventricle. They have papillary muscles attached to them. The chordae tendineae are string-like tendons which connect these valves to the papillary muscles.

During the pumping action of the heart, immense intraventricular pressure is created during systole or ventricular contraction. The atrioventricular valves shut their cusps to ensure no backflow of blood occurs from the ventricles to the auricles. The chordae tendineae play a vital role in holding the cusps of these valves in place and preventing the prolapsing of the mitral and tricuspid valves.

If we talk of the semilunar valves, their role to avoid back flow of blood is at the sites and situations where the pressure of the blood is lower compared to the atrioventricular valves. The pulmonary valve is present at the junction of the right ventricle and the pulmonary trunk. The aortic valve is present at the junction of the left ventricle and the aorta.

During the ventricular systole when the pressure in ventricles becomes greater than the pulmonary artery or the aorta these valves open an allow blood to flow though them. When the pressure in the ventricles decreases during diastole, these valves close on their own. Since their closure is directly associated with the lower pressure of blood they do not require strong tendons like chordae tendineae to keep them in position.

Conclusion

The mechanism and role of the closing of atrioventricular valves and the semilunar valves are directly related to the intraventricular pressure during the pumping action of the heart. During systole, when intra ventricular pressure is high the bicuspid and tricuspid valves close while the semilunar valves open. During diastole or low intraventricular pressure, the situation is reversed. Hence, the presence of chordae tendineae is more critical of atrioventricular valves than the semilunar valves.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Summary Introduction

To analyze:

Why the presence of chordae tendineae is more critical for the atrioventricular valves than semilunar valves.

Introduction:

Chordae tendineae also called the heartstrings are closely associated with the papillary muscles of the atrioventricular valves. The semilunar valves, however, lack them.

Answer 12

Explanation of Solution

The atrioventricular valves are situated between the auricles and ventricles − the tricuspid valve between the right auricle and the right ventricle while the mitral or bicuspid valve between the left auricle and the left ventricle. They have papillary muscles attached to them. The chordae tendineae are string-like tendons which connect these valves to the papillary muscles.

During the pumping action of the heart, immense intraventricular pressure is created during systole or ventricular contraction. The atrioventricular valves shut their cusps to ensure no backflow of blood occurs from the ventricles to the auricles. The chordae tendineae play a vital role in holding the cusps of these valves in place and preventing the prolapsing of the mitral and tricuspid valves.

If we talk of the semilunar valves, their role to avoid back flow of blood is at the sites and situations where the pressure of the blood is lower compared to the atrioventricular valves. The pulmonary valve is present at the junction of the right ventricle and the pulmonary trunk. The aortic valve is present at the junction of the left ventricle and the aorta.

During the ventricular systole when the pressure in ventricles becomes greater than the pulmonary artery or the aorta these valves open an allow blood to flow though them. When the pressure in the ventricles decreases during diastole, these valves close on their own. Since their closure is directly associated with the lower pressure of blood they do not require strong tendons like chordae tendineae to keep them in position.

Answer 13

Conclusion

The mechanism and role of the closing of atrioventricular valves and the semilunar valves are directly related to the intraventricular pressure during the pumping action of the heart. During systole, when intra ventricular pressure is high the bicuspid and tricuspid valves close while the semilunar valves open. During diastole or low intraventricular pressure, the situation is reversed. Hence, the presence of chordae tendineae is more critical of atrioventricular valves than the semilunar valves.

Answer 14

Ch. 19 - Visit this site...Ch. 19 - Which of the following is not important in...Ch. 19 - Which valve separates the left atrium from the...Ch. 19 - Which of the following lists the valves in the...Ch. 19 - Which chamber initially receives blood from the...Ch. 19 - The ________ layer secretes chemicals that help to...Ch. 19 - The myocardium would be the thickest in the...Ch. 19 - In which septum is it normal to find openings in...Ch. 19 - Which of the following is unique to cardiac muscle...Ch. 19 - The influx of which ion accounts for the plateau...

Videos

Explanation of Solution

Want to see more full solutions like this?

Chapter 19 Solutions

Additional Science Textbook Solutions