PSI Barbering Practice Exam

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What is the primary role of capillaries in the circulatory system?

Transport oxygen
Regulate blood flow
Bring nutrients and carry away waste
Store blood

The correct answer is: Bring nutrients and carry away waste

The primary role of capillaries in the circulatory system is to bring nutrients and carry away waste. Capillaries are the smallest blood vessels in the body, forming a network that connects arterioles (small arteries) and venules (small veins). Their thin walls, composed of a single layer of endothelial cells, allow for efficient exchange of substances between the blood and surrounding tissues. In this context, capillaries facilitate the delivery of essential nutrients, such as glucose and amino acids, to the body's cells. Simultaneously, they are vital for removing waste products — including carbon dioxide and metabolic byproducts — from the tissues and transporting them back to the bloodstream for eventual elimination by the lungs or kidneys. This function is crucial for maintaining homeostasis and supports cellular processes, reinforcing why capillaries are so essential in the circulatory system.