Electrolysis Practice Exam

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

Transport blood away from the heart
Exchange nutrients and waste
Store blood
Regulate blood pressure

The correct answer is: Exchange nutrients and waste

The primary function of capillaries in the circulatory system is to facilitate the exchange of nutrients, gases, and waste products between the blood and surrounding tissues. Capillaries are tiny blood vessels with very thin walls that allow for this diffusion process, making it possible for oxygen to enter tissues and for carbon dioxide and other metabolic wastes to be removed efficiently. This exchange is crucial for maintaining homeostasis and the health of cells throughout the body. While other components of the circulatory system play roles in transporting blood, storing it, or regulating pressure, capillaries are uniquely designed for this vital exchange process, underscoring their crucial importance in overall circulatory function.