Ch.42 - Circulatory SystemSee all chapters
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Ch.1 - Introduction to Biology
Ch.2 - Chemistry
Ch.3 - Water
Ch.4 - Carbon
Ch.5 - Biological Molecules
Ch.6 - Cells
Ch.7 - The Membrane
Ch.8 - Energy and Metabolism
Ch.9 - Respiration
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Ch.11 - Cell Signaling
Ch.12 - Cell Division
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Ch.14 - Mendelian Genetics
Ch.15 - Chromosomal Theory of Inheritance
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Ch.41 - Digestive System
Ch.42 - Circulatory System
Ch.43 - Immune System
Ch.44 - Osmoregulation and Excretion
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Ch.55 - Conservation Biology

Heart Physiology

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Sections
Circulatory and Respiratory Anatomy
Heart Physiology
Gas Exchange
Additional Problems
Which of the following would take the longest time to regulate blood pressure?a. hormonal control of peripheral resistanceb. chemoreceptor-initiated reflexesc. baroreceptor-initiated reflexesd. renal regulation
Why do AV nodal cells NOT determine the heart rate under normal circumstances? a. They depolarize faster than all other conducting fibers. b. They depolarize slower than all other conducting fibers. c. They slow conduction of the wave of excitation. d. As depolarization initiated in the SA node reaches the AV node, it leaves the AV node in a refractory state. e. The AV node is connected to the SA node, but not to other conducting fibers in the heart. 
What causes the abnormal swishing or whooshing sound that is heard as blood regurgitates back into an atrium from its associated ventricle?a. pulmonary trunk expansionb. blood turbulencec. semilunar valve closured. aortic recoil
Why is blood pressure higher during systole than during diastole?a. The contraction of the heart during systole increases the blood pressure against arterial walls.b. More blood flows into the heart during systole than during diastole.c. The relaxation of the heart during systole increases the blood pressure against arterial walls.d. The contraction of the heart during systole increases the blood pressure against the valves separating the atria from the ventricles.e. The contraction of the heart during diastole decreases the blood pressure against arterial walls.
Which of the following is the correct sequence of blood flow in birds and mammals?a. left ventricle → aorta → lungs → systemic circulationb. vena cava → right atrium → right ventricle → pulmonary veinc. pulmonary vein → left atrium → left ventricle → pulmonary circuitd. vena cava → right atrium → right ventricle → pulmonary artery
An electrocardiogram (ECG) provides information about ________.a. the pressure of blood in the heart chambersb. the rhythm of heart contractionsc. the amount of oxygen in the blood as it leaves the heartd. the speed of blood flow through the blood vessels
How does blood pressure in the aorta change as the heart goes through a cardiac cycle, and why?a. Blood pressure in the aorta increases during systole as the result of increased blood volume in the ventricles.b. Blood pressure in the aorta increases during systole as the result of muscle contraction in the ventricles.c. Blood pressure in the aorta increases during diastole as the result of increased blood volume in the ventricles.d. Blood pressure in the aorta increases during diastole as the result of muscle contraction in the ventricles.
Blood returning to the mammalian heart in a pulmonary vein drains first into the a. left atrium. b. right atrium. c. left ventricle. d. right ventricle.
Pulse is a direct measure ofa. blood pressure.b. stroke volume.c. cardiac output.d. heart rate.
With age, the tissues making up a heart valve can lose flexibility and become stiff and narrowed while retaining their one-way closure properties. Suppose a man's aortic valve is affected by this condition but his ventricles do not change their force of contraction. Which of the following will likely happen?a. Volume of blood flowing out of the left ventricle during a contraction will increase.b. The body's total blood volume will drop.c. Blood will flow more rapidly than normal through the atria and right ventricle.d. Pressure within the left ventricle will increase during the systole phase.
What is happening during the “pause” phase when the heart is resting (relaxing)?a. Ventricles are contracting.b. Atria are contractingc. Ventricles are filling
What is the function of the papillary muscles and the chordae tendinae? 
From inside to outside, list the layers of the heart wall and coverings of the heart. Be sure to list the visceral and parietal layer names as well.
How do the structural differences between the right and left ventricles relate to the functioning of these chambers?
diastolic pressure+ (pulse pressure/3) - MAP: what is MAP an acronym for?
(Blood Pressure Measurement) What is blood pressure? Can you list other possible ways to measure blood pressure?
What differentiates cardiac muscle cells from normal muscle cells? Describe briefly how this special property is harnessed in the beating of the heart.
What parts of the cardiac cycle do the different waves in the EKG correspond P: QRS: T:
How do the structural differences between the right and lift ventricles relate to the functioning of these chambers?
What does the QRS complex represent?
What is the function of the chordae tendineae and the papillarv muscles?
What is the myocardium?
During the systolic phase of the cardiac cycle, the heart is _____.A. ContractingB. RelaxingC. Contracting and relaxingD. Filling with blood