MEDICAL
ARTERIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The heart contracts and sends bloods to the arteries.
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The heart relaxes and blood enters from the veins.
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Either A or B
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None of the above
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Detailed explanation-1: -Diastole begins with the closing of the aortic valve (or pulmonic) and ends with the closing of the mitral valve (or tricuspid). This period encompasses the ventricular relaxation and filling. Diastole represents when the blood vessels return blood to the heart in preparation for the next ventricular contraction.
Detailed explanation-2: -Diastole is when the heart muscle relaxes. When the heart relaxes, the chambers of the heart fill with blood, and a person’s blood pressure decreases.
Detailed explanation-3: -Diastole represents the period when the ventricles are relaxed (not contracting). Throughout most of this period, blood is passively flowing from the left atrium (LA) and right atrium (RA) into the left ventricle (LV) and right ventricle (RV), respectively (see figure at right).
Detailed explanation-4: -Accordingly, when the heart chambers are relaxed (diastole), blood will flow into the atria from the veins, which are higher in pressure. As blood flows into the atria, the pressure will rise, so the blood will initially move passively from the atria into the ventricles.