Question

GIVE REASON
1. Pulmonary vein carries oxygenated blood.
2.The lubb-dup sounds are produced during heartbeat.
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Answer 1

Explanation:

1. The pulmonary veins carry oxygenated blood from the lungs into the left atrium where it isreturned to systemic circulation. The aorta is the largest artery in the body. It carries oxygenated blood from the left ventricle of the heart into systemic circulation.
2. The period between the end of one heart beat to the end of the next heart beat is called a cardiac cycle. ... During a ventricular systole, the closing of auriculoventricular valves at the start of the ventricular systole produces the first heart sound called lubb or systolic sound.

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Answer 2

1) The pulmonary veins carry oxygenated blood from the lungs into the left atrium where it is returned to systemic circulation. The aorta is the largest artery in the body. It carries oxygenated blood from the left ventricle of the heart into systemic circulation.

2) The “ lub” is the first heart sound, commonly termed S1, and is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole. The second sound,” dub” or S2, is caused by the closure of aortic and pulmonic valves, marking the end of systole.