Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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- When the ventricular walls contract
A. the mitral valve opens, and the tricuspid valve closes.
B. the tricuspid valve opens, and the mitral valve closes.
C. the mitral and tricuspid valves close.
D. the mitral and tricuspid valves open.
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Introduction
Ventricles are the two lower chambers of the heart, located below the atria. The heart has four chambers, with two atria at the top and two ventricles at the bottom. The right ventricle is responsible for pumping deoxygenated blood from the heart to the lungs to be oxygenated, while the left ventricle pumps oxygenated blood from the heart to the rest of the body.
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- Cardiac output measures blood ejected from a. both atria each minute b. each ventricle each minute c. both ventricles each minute d. each atrium each minute e. each atrium each beatarrow_forwardThe QRS wave of an ECG (or EKG) represents: a. depolarization of the ventricles. b. Depolarization and repolarization of the ventricles. c. Depolarization of the atria and ventricles. d. depolarization of the atria.arrow_forwardThe great cardiac vein and middle cardiac vein empty into a venous cavity called the Select one: a. coronary sinus. b. inferior vena cava. c. coronary artery. d. superior vena cava. e. pulmonary vein.arrow_forward
- During the period of isovolumic contraction: A. the AV-valves are open and the aortic & pulmonary arterial valves are closed. B. all valves are open. C. all valves are closed. D. the AV-valves are closed and the aortic & pulmonary arterial valves are open. E. None of the above is correct.arrow_forwardThe vasa vasorum Select one: a. are special capillaries that supply nutrients to the walls of arteries and veins. b. are incompetent valves in the large veins. c. supply blood to skeletal muscle. d. are the blood vessels that supply blood to the vas deferens. e. are blood vessels that directly connect arteries to veins.arrow_forwardWhich portion of the ECG corresponds torepolarization of the atria?a. P waveb. QRS complexc. T waved. none of the above: atrial repolarization is maskedby ventricular depolarizationarrow_forward
- In the aorta, Select one: a. the resistance to blood flow is high, but velocity of blood flow is low. b. the velocity of blood flow is high, but blood pressure is low. c. velocity is diminished because the total cross-sectional area is small. d. the blood pressure and blood velocity are both high. e. the resistance to blood flow and the blood pressure are both low.arrow_forwardWhich primitive area of the heart will give rise to theright ventricle?a. bulbus cordisb. primitive ventriclec. sinus venosusd. truncus arteriosusarrow_forwardDuring atrial fibrillation: A. The EKG shows an exaggerated P wave. B. There is a noticeable increase in the regularity of beating. OC. The ventricle undergoes reentrant refractoriness. OD. None of the above. OE. All of the above.arrow_forward
- As the ventricular pressure increases, the AV closes. This then result into abrief period of time when the semilunar valves and AV valves are both closed.Describe the relationship of pressure in the ventricle to atrium and aortaduring this time. What is this phase called?arrow_forwardThe period of ejection: A. begins with closure of the AV-valves and ends with opening of the AV- valves B. begins with opening of the aortic valve and ends with closure of the aortic valve C. begins with the P-wave and ends with the QRS-complex D. begins with the QRS-complex and ends with the T-wavearrow_forwardWhen the ventricles contract with more force this causes the _____ volume to be larger and the ____ volume to be smaller. A end diastolic; stroke B stroke; end systolic C end systolic; end diastolicarrow_forward
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