answersLogoWhite

0

Capillaries are the smallest blood vessels in the body, connecting arterioles and venules. They have thin walls composed of a single layer of endothelial cells, allowing for the efficient exchange of gases, nutrients, and waste between blood and surrounding tissues. Their narrow diameter facilitates close contact with cells, while their extensive network increases surface area for optimal exchange. Additionally, capillaries are often involved in regulating blood flow through mechanisms such as pre-capillary sphincters.

User Avatar

AnswerBot

1mo ago

What else can I help you with?