Anatomy & Physiology
1st Edition
ISBN: 9781938168130
Author: Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Publisher: OpenStax College
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Textbook Question
Chapter 19, Problem 30CTQ
How does the delay of the impulse at the atrioventricular node contribute to cardiac function?
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Chapter 19 Solutions
Anatomy & 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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- What anatomic features slow the conduction rate of the action potential as it passes through the AV node? What is the function of this delay?arrow_forwardWhat pressure difference between the ventricle and the atrium causes theatrioventricular valve to close?arrow_forwardWhat effect will orthostatic hypotension have on the sino-atrial node of the heart?arrow_forward
- What events occur in the ventricles during late ventriculardiastole?arrow_forwardPressure changes that occur during the cardiac cycle are responsible for what two physiologic processes within the heart?arrow_forwardWhich chamber has higher pressure during the following phases of the cardiac cycle? a) ventricular ejection, b) isovolumic ventricular relaxation, c) atrial and ventricular diastole, d) isovolumic ventricular contraction. Why?arrow_forward
- What areas of the heart are deprived of blood when there is a blockage in the posterior interventricular artery?arrow_forwardWhat effects does the parasympathetic nervous system have on cardiac output?arrow_forwardHow does vasoconstriction in the skin and viscera resultin increased venous return to the heart?arrow_forward
- Why doesn't shortening the diastolic time decrease ventricular filling and thus decrease cardiac output?arrow_forwardHow does an EKG reflect the electrical activity in a heartbeat? How do these waves correspond to electrical activity and the cardiac cycle?arrow_forwardWhich part of the intrinsic conduction system directly excites ventricular myocardial cells? In which direction does the depolarization wave travel across the ventricles?arrow_forward
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