Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 36.3, Problem 2TYK
Summary Introduction
Introduction:
The myogenic heart is electrically excitable and initiates its own action potential. The nervous system regulates the rate and force required for the beating of myogenic heart.
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What keeps the atrioventricular (AV) valves from being pushed open as the ventricles contract?
Pressure of blood pushing against the valves.
Contraction of the atria.
Closure of the semilunar valves.
Contraction of papillary muscles and tightening of chordae tendineae.
All valves are closed,
ventricular pressure
decreases.
Blood flows passively
through the atria and
AV valves.
All valves are closed;
ventricular pressure
increases.
Blood is forced
through the semilunar
valves by high
pressure.
Receiving chamber
pressure increases;
more blood exits
through AV valves.
Left atrium:
Right atrium-
Left ventricle
Right ventricle-
Ventricular
filling
Atrial
contraction
Mid-to-late diastole
(ventricular filling)
Isovolumetric
Ventricular
contraction phase ejection phase
Ventricular systole
(atria in diastole)
Isovolumetric
relaxation
3
Early diastole
The heart is resting during
Select one:
ventricular systole.
the ejection period.
ventricular diastole.
atrial systole.
Chapter 36 Solutions
Principles of Biology
Ch. 36.1 - Prob. 1CCCh. 36.1 - Prob. 1TYKCh. 36.1 - Prob. 2TYKCh. 36.2 - Prob. 1BCCh. 36.2 - Prob. 1TYKCh. 36.2 - Which is false? Platelets are nucleated cells that...Ch. 36.3 - Prob. 1CCCh. 36.3 - Prob. 2CCCh. 36.3 - Prob. 3CCCh. 36.3 - Prob. 1TYK
Ch. 36.3 - Prob. 2TYKCh. 36.4 - Prob. 1CCCh. 36.4 - Prob. 1TYKCh. 36.4 - Prob. 2CCCh. 36.4 - Prob. 2TYKCh. 36.5 - Prob. 1TYKCh. 36.5 - Prob. 2TYKCh. 36.6 - Prob. 1TYKCh. 36.7 - Prob. 1CCCh. 36.7 - Prob. 1BCCh. 36.7 - Prob. 2CCCh. 36.7 - Prob. 3CCCh. 36.7 - Prob. 1TYKCh. 36.7 - Which of the following statements is false? The...Ch. 36.8 - Prob. 1TYKCh. 36.8 - Prob. 2TYKCh. 36.9 - Prob. 1CCCh. 36.9 - Prob. 1TYKCh. 36.9 - Prob. 2TYKCh. 36.10 - Prob. 1BCCh. 36.10 - Prob. 1TYKCh. 36.11 - Prob. 1TYKCh. 36.11 - Prob. 2TYKCh. 36.11 - Prob. 3TYKCh. 36 - Prob. 1TYCh. 36 - Prob. 2TYCh. 36 - Prob. 3TYCh. 36 - Prob. 4TYCh. 36 - Considering blood flow through a closed...Ch. 36 - Prob. 6TYCh. 36 - Prob. 7TYCh. 36 - Prob. 8TYCh. 36 - Prob. 9TYCh. 36 - Prob. 10TYCh. 36 - Discuss the difference between closed and open...Ch. 36 - Prob. 2CCQCh. 36 - Prob. 3CCQCh. 36 - Prob. 1CBQCh. 36 - List the components of the mammalian respiratory...
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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_forwardFigure 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_forwardWhich of the following situations might indicate the need for an artificial pacemaker? Group of answer choices The AV node is not sending signals to the ventricles. The SA node is not functioning properly to generate action potential at the proper intervals. The Purkinje fibers are not distributing the signal properly. The heart valves are not directing blood flow through the chambers properly.arrow_forward
- Automaticity of the heart is the result of: Group of answer choices K+ leaking into the cell. Na+ leaking into the cell. K+ leaking out of the cell. Ca++ leaking out of the cell. more than one of the above.arrow_forwardChordae tendineae: Group of answer choices hold the AV valves in place. contract when the heart contracts. are one part of the conductance system of the heart. regulate blood flow into the ventricles. are stretched during ventricular systole.arrow_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
- Put these phases of the cardiac cycle in the correct order. opening of the semilunar valves isovolumetric contraction atrial systole begins closure of the AV valves ventricular filling is complete ventricular systole begins ventricular relaxation ventricular ejectionarrow_forwardleft coronary artery great cardiac vein right coronary artery circumflex branch coronary sinus middle cardiac vein 5% of systemic circulation is blood flowing through the coronary circulation. The branches into the anterior interventricular branch (which supplies both ventricles and the anterior 2/3 of the interventricular septum), and the ,which supplies the left atrium and posterior wall of the left ventricle. The supplies the right atrium and sinoatrial node. Blood is returned to the right atrium through a series of cardiac veins. The collects blood from the anterior portion of the heart and empties into the coronary sinus. The collects blood from the posterior portion of the heart and drains into thearrow_forwardWhy is resting heart rate somewhat slower than the 80–100 bpm set by the SA node? The AV bundle branches slow the heart rate down. Sympathetic fibers release norepinephrine to slow heart rate. The AV node slows the heart to an average between its own rate and that of the SA node. Parasympathetic effects dominate in a resting individualarrow_forward
- during the four phases of the cardiac cycle. Which valves open/close during these phases? Ventricular Isovolumetric Ventricular Isovolumetric Filling Contraction Ejection Relaxation Blood Flow Low Ventricular Volume Ventricular Pressure Aortic Pressure Which valves open/close in the beginning ofarrow_forwardThe pacemaker that determines the heart rate Purkinje fibers The electrical gateway to the ventricles AV bundle Sinoatrial (SA) node Signals leave the AV node and descend along this structure toward the apex Atrioventricular (AV) node Distributes the electrical excitation to the ventriclesarrow_forwardThe semilunar valves prevent blood from moving: Group of answer choices from the atria back into the veins. from the ventricles back into the atria. from the arteries back into the ventricles. moving backward in the capillaries. moving backward in the arteries.arrow_forward
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