In a person at rest, the largest volume of blood is in _______.

1. a. arteries
2. b. capillaries
3. c. veins
4. d. arterioles

Introduction: The regular pumping of the heart maintains a continuous flow of blood all over the body. Deoxygenated blood from the peripheral organs move towards the right atrium through the venous system and gets oxygenated in the lungs and return back to the left atrium. Then, the blood flows to the left ventricle and by subsequent contraction of the heart, the oxygenated blood gets pumped out into different body parts.

Reason for the correct answer:

The heart is a muscular pumping organ that always pumps oxygenated blood to different body parts. Based on the necessity only, the pumping rate will vary. If the body demands high oxygen for any particular function to be carried out, then a signal from that part will be passed by the nervous system. It stimulates the heart to pump at a high rate, so that the required body part will get enough oxygen. Only arterial vessels carry oxygenated blood and veins carry deoxygenated blood from different body parts. When a person is at rest, his body does not need excess oxygen other than the normal rate. Therefore, the blood volume inside the arteries would be less and the veins contain the largest volume.

Option c. is given as “veins”. When a person is at rest, the largest blood volume will be present only in veins. Therefore, option c. is the correct answer.

Reasons for the incorrect answers:

Option a...