When a person is at rest, which of the following 1pt statements is true when the

Question

When a person is at rest, which of the following 1pt statements is true when the left ventricle fills with blood? o 20% of the filling is the result of left atrial contraction. o 80% of the filing is the result of left atrial 100% of the filing is passive flow of blood down the o 100% of the filling is the result of left atrial contraction. pressure gradient. contraction. & Check Answer Which of the following is true of the hand? the radial artery is blocked, the ulnar artery can only supply the fourth and fifth fingers. supply all of the hand. and index finger; and to the third, fourth, and fifth 0 If the ulnar artery is blocked, the radial artery can O There are separate blood supplies to the thumb fingers Check Answer The mitral valve lies between the left atrium and 1 pt left ventricle. Which of the following occurs during the cardiac cycle? ° The mitral valve opens at the start of ventricular contraction. o The mitral valve opens at the start of ventricular relaxation. The mitral valve opens only after ventricular pressure exceeds aortic pressure. oThe mitral valve opens only after ventricular pressure falls below left atrial pressure

Explanation / Answer

1) a) at rest the left ventricle is filled with blood passively. And atrial contraction accounts for about 20% of ventricle filling.

2) b) if the ulnar artery is blocked, the radial artery can supply all that hand.

3) d- mitral valves open only after the ventricular pressure falls below left atrial pressure

4) b- it is driven by elastic recoil of major arteries

5) same volume of blood is ejected by both the ventricle.

6) c- ventricle contraction expels ~70% of the blood from the ventricle

7)c- blood is ejected into the aorta only after ventricular pressure is more than aortic pressure

8) all of these assist

9) arterial venous fistulae, arteries and arterioles has pulsatile blood pressure.

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