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
ventricular systole
ventricular diastole
isovolumetric relaxation
diastisis
ncreasing preload __________ ventricular contractility.
decreases
has no effect on
increases
Select the correct answer for each question. Explain why you chose that answer as opposed to the others. In other words, explain why the other choices are incorrect.
The plateau phase of an action potential in cardiac muscle cells is due to the _____.
Efflux of K+ through K+ channels
Efflux of Ca2+ through fast Ca2+ channels
Influx of Ca2+ through slow Ca2+ channels
Influx of Na+ through fast Na+ channels
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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- The heart beats without extrinsic stimulation from the autonomic nervous system. True or Falsearrow_forward____ blood pressure is blood pressure during heart dilationarrow_forwardRepolarization of ventricular myocardiocytes is caused by ______ the cells through voltage-gated channels. A potassium entering B potassium leaving C sodium entering D sodium leaving E calcium enteringarrow_forward
- Frog: _______ help to separate the systemic and pulmonary circulationarrow_forwardIdenitfy each structure on the heart modelarrow_forwardRepolarization of the ventricles typically _______. A begins at the end of the T-wave and continues through the next P wave B occurs throughout the duration of the S-T segment of the electrocardiogram C begins at the top center of the ventricles like depolarization D begins at the apex of the ventricles and occurs in the opposite direction as depolarization.arrow_forward
- If pulse pressure is calculated to equal 40 mm Hg and diastolic pressure is 70 mm Hg, then systolic pressure must have been __________. 30 mm Hg 90 mm Hg 110 mm Hg 140 mm Hg none of the abovearrow_forwardS2 heart sounds (“dub”) represent the closing of thearrow_forwardSelect the best answer or answers from the choices given: In the heart, which of the following apply? (1) Action potentials are conducted from cell to cell across the myocardium via gap junctions, (2) the SA node sets the pace for the heart as a whole, (3) spontaneous depolarization of cardiac cells can occur in the absence of nerve stimulation, (4) cardiac muscle can continue tocontract for long periods in the absence of oxygen. (a) all of the above, (b) 1, 3, 4, (c) 1, 2, 3, (d) 2, 3.arrow_forward
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