a) Match the regions (Red, Green, Blue) with the functiontions. A. Contraction of the atria B. Contraction of the ventricles C. Repolarization of ventricles D. Repolarization of atrium b) Estimate the heart rate (beats per min) corresponding to the ECG above given that one heart beat takes 0.75s. beats per minute

Q: When ventricular walls relax: a. Mitral valve opens & tricuspid valve closes b. Tricuspid valve…

A: Mitral valve is also called the bicuspid valve  and it connect left Atrium to the left ventricle.…

Q: During diastole: A. the AV-valves are open and the aortic & pulmonary arterial valves are closed. B.…

A: Systole and diastole are part of cardiac cycle. Systole means contraction of heart and diastole…

Q: Describe the events leading up to contraction in a cardiac contractile cell. (Where does the…

A: Cardiac muscles are similar to skeletal muscles with a few differences:-a) Contraction is…

Q: In terms of being open or closed, what is the state of the mitral and tricuspid valve (left and…

A: Heart is a muscular structure. In human, it consists of 4 chambers - 2 atrium and 2 ventricles.…

Q: Afterload is Select one: a. the amount cardiac output must increase during exercise. b. the…

A: The objective of the question is to identify the correct definition of the term 'afterload' in the…

Q: The AV node delay: a. allows the atria and ventricles to depolarize and contract as a unit. b.…

A: The human heart consists of the left and right atria and the left and right ventricles. The heart…

Q: What two values are needed in order to calculate cardiac output (CO) for a ventricle? a.…

A: Answer is c.)  stroke volume (SV) and heart rate (HR) .

Q: An ECG measures a. changes in electrical potential during the cardiac cycle. b. Ca2+…

A: Introduction: ECG or electrocardiogram is a machine that helps analyse the condition of the heart.…

Q: What will happen to the next level of exercise tolerance in a person whose heart is being paced by…

A: The human circulatory system, also called the cardiovascular system consists of a muscular chambered…

Q: Match the following:   ? Prevents backflow into the left ventricle   ?  Prevents backflow into the…

A: Valves are flap like structures which are present in heart and helps in movement of blood in one…

Q: an increase of which of the following will increase mean artrial pressure a. venous return b.…

A: The heart's role in any organism is to keep "blood" flowing continuously throughout the body. Blood…

Q: Identify the correct sequence of blood flow through the chambers of the heart.   A "left ventricle,…

A: BLOOD FIRST ENTERS THE RIGHT ATRIUM AND THEN PASSES THROUGH THE RIGHT VENTRICLES. FROM RIGHT…

Q: The pulse pressure is a measure of a. the number of heartbeats per minute. b. the sum of the…

A: Blood pressure records two measurements: systolic pressure and diastolic pressure wherein systolic…

Q: 45. Which of the following is/are true concerning the opening and closing of thecardiac valves?   A.…

A: The valves of the heart maintain undirectional flow of the blood and prevent its regurgitation in…

Q: Left ventricular output is generally the same as right ventricular output. If right ventricular…

A: On an average, 70 ml of blood is pumped every beat (stroke volume) and about 5000 ml every minute…

Q: During surgery, the right vagus nerve was accidently cut. Explain the effect on the heart rate. a.…

A: It has three components: blood, heart and the blood vessels. Heart is derived from the mesodermal…

Q: In a healthy young adult, what happens to cardiacoutput when heart rate increases above 160 bpm?a.…

A: Cardiac output is also known as heart output. It describes the amount of blood being pumped by the…

Q: As a result of ventricular depolarization (T wave), calcium ions are returned to the sarcoplasmic…

A: T wave on ECG denotes ventricular repolarisation or relaxation. It occurs after the QRS segment…

Q: Sketch and discuss the most important waveforms associated to the cardiac cycle and what is the…

A: A sequence of alternating contraction and relaxation of the atria and ventricles in order to pump…

Q: The delivery of blood by the left ventricle into the sorta is intermittent, whereas blood flow in…

A: Peripheral circulation refers to blood flow in smaller blood vessels such as arterioles and…

Q: Which heart valve(s) is/are open during the Ejection phase of the cardiac cycle?   A. Tricuspid…

A: The cardiovascular system of the body is concerned with the circulation of blood rich in oxygen to…

Q: Explain the term isovolumetric ventricular contraction?

A: The cardiac cycle in animals is the result of the atrial and ventricular contraction and relaxation…

Q: Blood flow into the _______________ would ________________if the right side of the heart failed.…

A: Introduction: To supply blood, the heart encloses four chambers. The blood flow cycle is completely…

Q: A. What could be the implicatiosn for the atrial and ventricular contraction-relaxation? B. Draw…

A: If the pacemaker activity in the atrioventricular (AV) node overtakes the sinus node (SA node)…

Q: Changes in the cardiac rate primarily reflect changes in the duration of a. systole. b. diastole.

A: Introduction: The two significant phases of the cardiac cycle are systole and diastole. The…

Q: a. Ventricular diastole b. Throughout the cardiac cycle c. Between cardiac cycles  d. Ventricular…

A: Heart It is the main component of the circulatory system. It pumps the blood to various parts of the…

Q: The innermost serous membrane attached to the heart muscle is called the: a. visceral pericardium.…

A: The serous membrane can be defined as the type of membrane which covers the internal cavity. It is a…

Q: Assume that one ventricle of a child’s heart has an EDV of 90 mL, an ESV of 60 mL, and a cardiac…

A: Cardiac output: is the product of heart rate multiplied by the stroke volume. The stroke volume…

Q: The force the ventricles must work against to pump blood is called A. Myocardial contractility B.…

A: The heart has four chambers, the above two chambers are known as the atrium, and the below two…

Q: 3) which of the following is the correct sequence of events during ventricular systole? 1- AV valves…

A: The human heart's activity from the start of one heartbeat to the start of the next is known as the…

Q: What is the relationship between the elapsed time (Delta T) between R wave (R-R Interval) and the…

A: Heart rate refers to the number of times the heart beats per minute (bpm). It is a measure of the…

Q: At the instant following the second heart sound, which heart valves are open?

A: Heart sounds are heard with the help of a stethoscope.  When the heart sound is defective then this…

Q: The cardiac plateau is mediated by ________ and it________ ventricular repolarization. Group of…

A: The cardiac plateau is a phase in the cardiac action potential. This phase is characterized by a…

Q: During which of the following periods are the large elastic arteries distributing blood to smaller…

A: The cardiac cycle is referred to as one heartbeat that consists of one cycle of contraction and…

Q: entricular contraction begins at the Select one: a. AV bundle. b. apex of the heart. c. top of the…

A: The objective of the question is to identify the location where the contraction of the ventricles,…

Q: The function of structure X is to Select one: a. act as the pacemaker of the heart. b. initiate the…

A: Heart is located in the chest cavity and derived from mesodermal tissue. Heart is surrounded and…

Q: Indicate the corect statement:

A: The right coronary artery is the first branch of the ascending aorta just beyond the aortic…

Q: If the pressure in the ventricles is higher than the pressure in the atria, but lower than the…

A: Heart valves open and close in response to pressure changes inside the heart chambers. the fluid…

Q: which of the following factors will increase the cardiac output? a. decreased heart rateb. increased…

A: The objective of the question is to identify the factors that can increase the cardiac output.…

Q: Muscle impulses are spread rapidly between cardiac musclecells bya. sarcomeres.b. intercalated…

A: The heart is a muscular organ , located just behind and slightly left of the sternum. The heart is…

Q: The QRS wave of an ECG is produced by. a. depolarization of the atria. b. repolarization of the…

A: ECG or electrocardiogram is a diagram or graph of the electrical activity of heart that is produced…

Q: cardiac output will increase by a. decreased blood volume and decrease of heart contractility b.…

A: When both ventricles ( left as well as right ) pump some amount of blood in a given time , it is…

Q: Stroke volume is thea. amount of blood pumped by the heart per minute.b. difference between…

A: End-diastolic volume refers to the quantity of blood in the left or right ventricle at the end of…

Q: Explain why listening to the heart sounds can be clinically important.  In other words, what can…

A: The human heart pumps blood during the frame thru the vessels of the circulatory system, providing…