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 16RQ
Ventricular relaxation immediately follows ________.
- atrial depolarization
- ventricular repolarization
- ventricular depolarization
- atrial repolarization
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Pressure in the ventricle would be lowest during _____.
atrial systole
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isovolumetric relaxation
diastisis
When during the cardiac cycle do ventricles contain their maximal amount of blood?
At the end of ventricular systole.
At the end of ventricular diastole.
At the beginning of ventricular diastole.
Halfway through ventricular systole.
Role cardioregulatory centers play in regulating heart rate
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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- Clusters of neurons in the medulla oblongata that regulate blood pressure are known collectively as ________. baroreceptors angioreceptors the cardiomotor mechanism the cardiovascular centerarrow_forwardAt the end of ...........,the ventricles are 70% filled.arrow_forwardSome people have abnormal cords or bridges of myocardium that extend from atrium to ventricle, bypassing he AV node and other parts of the conduction system. How would you expect this to affect the cardiac rhythm?arrow_forward
- When the ventricles are no longer acting as a syncytium and can't pump blood, they are in ____. Group of answer choices ventricular tachycardia fibrillation bradycardia AV node blockarrow_forwardFill in the blank: An _______________________ is a recording of electrical changes occurring in the myocardium during a cardiac cycle.arrow_forwardFill in the blank: During ventricular relaxation, the A-V valves remain _______________________.arrow_forward
- Movemen of ions into/out of cardiac cells that allow for automaticity (depolarization/depolarization)arrow_forwardAs blood in the great arteries ricochets back against the closed semilunar valves, the second heart sound ("dupp") can be heard. Why does this heart sound occur towards the end of the T wave in an ECG?arrow_forwardFill in the blank: The maximum pressure achieved during ventricular contraction is called _______________________ pressure.arrow_forward
- The entry of calcium into a ventricular muscle cell helps to maintain depolarization of the membrane during the plateau phase of the action potential, but this calcium also performs what other function?arrow_forwardIn a normal heartbeat the atria contract ______. A at exactly the same time as the ventricles B immediately before the ventricles C immediately after the ventricles D at the very beginning of ventricular diastolearrow_forwardWhich of the following lists the events of the cardiac cycle in thecorrect order?a. both atria contract, then both ventriclesb. both ventricles contract, then both atriac. left atria and left ventricle contract, then right atria and rightventricled. right atria and right ventricle contract, then left atria and leftventriclearrow_forward
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