ANATOMY AND PHYSIOLOGY
17th Edition
ISBN: 9781630180928
Author: OpenStax
Publisher: OPENSTAX C
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Textbook Question
Chapter 19, Problem 12RQ
Which component of the heart conduction system would have the slowest rate of firing?
- atrioventricular node
- atrioventricular bundle
- bundle branches
- Purkinje fibers
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Chapter 19 Solutions
ANATOMY AND PHYSIOLOGY
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...
Ch. 19 - Which portion of the ECG corresponds to...Ch. 19 - Which component of the heart conduction system...Ch. 19 - The cardiac cycle consists of a distinct...Ch. 19 - Most blood enters the ventricle during ________....Ch. 19 - The first heart sound represents which portion of...Ch. 19 - Ventricular relaxation immediately follows...Ch. 19 - The force the heart must overcome to pump blood is...Ch. 19 - The cardiovascular centers are located in which...Ch. 19 - In a healthy young adult, what happens to cardiac...Ch. 19 - What happens to preload when there is venous...Ch. 19 - Which of the following is a positive inotrope? Na+...Ch. 19 - The earliest organ to form and begin function...Ch. 19 - Of the three germ layers that give rise to all...Ch. 19 - The two tubes that eventually fuse to form the...Ch. 19 - Which primitive area of the heart will give rise...Ch. 19 - The pulmonary trunk and aorta are derived from...Ch. 19 - Describe how the valves keep the blood moving in...Ch. 19 - Why is the pressure in the pulmonary circulation...Ch. 19 - Why is the plateau phase so critical to cardiac...Ch. 19 - How does the delay of the impulse at the...Ch. 19 - How do gap junctions and intercalated disks aid...Ch. 19 - Why do the cardiac muscles cells demonstrate...Ch. 19 - Describe one cardiac cycle, beginning with both...Ch. 19 - Why does increasing EDV increase contractility?Ch. 19 - Why is afterload important to cardiac function?Ch. 19 - Why is it so important for the human heart to...Ch. 19 - Describe how the major pumping chambers, the...
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- Figure 40.11 Which of the following statements about the heart is false? The mitral valve separates the left ventricle from the left atrium. Blood travels through the bicuspid valve to the left atrium. Both the aortic and the pulmonary valves are semilunar valves. The mitral valve is an atrioventricular valve.arrow_forwardThe contraction phase of the heartbeat is ______; the relaxation phase is _______.arrow_forward_____ contraction drives blood through the systemic and pulmonary circuits; outside the heart, blood pressure is highest in the _____. a. Atrial; ventricles b. Atrial; atria c. Ventricular; arteries d. Ventricular; aortaarrow_forward
- Which heart chamber has the thickest wall? a. right atrium c. left atrium b. right ventricle d. left ventriclearrow_forwardDuring which phase of the cardiac cycle do the ventricles begin to contract while the semilunar valves remain closed ? Group of answer choices Isovolumetric contraction Ventricular ejection Ventricular fillingarrow_forwardWhich of the following is not correct regarding the heart? ventricular fibrillation occurs from autorhythmic cells firing out of sequence the majority of cells are contractile, very few are autorythmic the atria and the ventricles contract at the same time both ventricles contract almost at the same timearrow_forward
- In the figure below on the left, label the P, QRS and T waves. Describe what is happening in the heart in the P wave: Relate the P wave to the cardiac cycle:o Is the heart in systole or diastole?o Is the pressure high or low?o Where is blood flowing? Which valves are open? closed? o Which muscle fibers are contracting, if any?arrow_forwardThe heart’s pacemaker is called the (complete term)_________. The pacemaker is composed of specialized________. The pacemaker first sends impulses that stimulate contraction of both_______. The (complete term)________introduces a delay in the transmission of pacemaker signals into the ventricles. Signals are conducted from this node directly into fibers called the________ . If the pacemaker loses control of heart contractions, ineffective quivering of the heart muscle, called_________, may occur.arrow_forwardIn the figure below on the left, label the P, QRS and T waves. Describe what is happening in the heart in the P wave: What is occurring in the electrical conduction system? Circle in the figure on the right, what part (if any) of the electrical conduction system is activated.arrow_forward
- The Centre for heart beat control is located in the medulla oblongata. True/False. Correct, if false.arrow_forwardWhich of the terms in the following pairs is correctly matched? Group of answer choices Heart contraction : systole Stroke volume : end systolic volume minus end diastolic volume End diastolic volume : volume of blood in the ventricle immediately after it has contracted Passive filling : blood moves into the ventricles because the atria contractarrow_forwardIf leaky Na+ channels in the cells of the SA Node became more leaky (allowed Na+ through at a faster rate), what would happen to the heart rate? a-it wouldn't change b-it would decrease c-it would increasearrow_forward
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