Biology
Blood flows in arteries in spurts and is under pressure. Which of the following reasons support this statement?
P. Arteries transport blood from left ventricles.
Q. Blood in left ventricle is at a high pressure.
R. Arteries have valves.
- Only P
- Only Q
- Only P and Q
- Only P and R
Answer
Only P and Q
Reason — Left ventricle pumps oxygenated blood at a high pressure to the rest of the body through arteries. This high-pressure blood is what causes the blood in the arteries to flow in a pulsatile manner, resulting in spurts.
Statement R, "Arteries have valves," is not relevant to the blood flow in arteries. Valves are typically found in veins to prevent the backflow of blood, not in arteries.
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