Question

Fall in blood pressure, due to loss of blood is soon restored because

• A. Blood vessels dilate
• B. Blood cells decrease in number
• C. Heart beat is increased
• D. Heart beat is decreased

Answer 1

The correct option is C Heart beat is increased

Bleeding reduces the blood volume which leads to in the blood pressure. The sensors activate the compensatory mechanisms to prevent blood pressure from decreasing too much. The heart rate increases, increasing the amount of blood pumped, the veins constrict, reducing their capacity to hold blood, and the arterioles constrict, increasing their resistance to blood flow.

So, the correct answer is option C.