1. You should be able to distinguish two heart sounds.  The first sound is when the ventricle begins contracting (ventricular systole) the atrioventricular valves snap shut.  This closing produces a low-pitched sound, the "lub" sound. The atrioventricular valves close when the ventricles contract due to pressure coming from the blood in the: Group of answer choices veins ventricles arteries atria

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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1. You should be able to distinguish two heart sounds.  The first sound is when the ventricle begins contracting (ventricular systole) the atrioventricular valves snap shut.  This closing produces a low-pitched sound, the "lub" sound. The atrioventricular valves close when the ventricles contract due to pressure coming from the blood in the:
Group of answer choices
veins
ventricles
arteries
atria
 
2. 
The "lub" sound is accompanied by the pulmonary and aortic (semilunar) valves opening. This, too, happens when the ventricles contract. These valves open due to pressure of the blood coming from the:
Group of answer choices
atria
ventricles
arteries
veins
 
3. The second sound you hear in the heartbeat is when the ventricles begin to relax (diastole). The closing of the pulmonary and aortic (semilunar) valves produces a sound, the "dub" sound. These valves close when the ventricles relax due to the pressure of the blood coming from the:
Group of answer choices
atria
veins
ventricles
arteries
 
4. When the ventricles begin to relax (diastole), the pulmonary and aortic (semilunar) valves close, but the atrioventricular valves open. These valves open as a result of pressure from the:
Group of answer choices
atria
arteries
veins
ventricles
 
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