Capillaries

Capillaries are the smallest blood vessels in the body, with a diameter that is just large enough for red blood cells to pass through in single file. They form a vast network that connects the arterioles and venules, allowing for the exchange of gases, nutrients, and waste products between the blood and the surrounding tissues.

Structure of Capillaries

Capillaries are composed of a single layer of endothelial cells, which are thin and flat to facilitate the exchange of substances. Their walls are permeable, allowing for the diffusion of oxygen, carbon dioxide, nutrients, and waste products.

Function of Capillaries

The primary function of capillaries is to facilitate the exchange of substances between the blood and the surrounding tissues. Oxygen and nutrients are delivered to the tissues, while carbon dioxide and waste products are removed from the tissues and transported back to the heart and lungs for elimination.

Study Guide

1. What are capillaries and where are they located in the body?
2. Describe the structure of capillaries and how it facilitates their function.
3. Explain the primary function of capillaries in the body.
4. Discuss the importance of capillaries in the circulatory system.
5. How do capillaries contribute to the overall health and function of the body?

Understanding the structure and function of capillaries is crucial for comprehending the circulatory system and the overall functioning of the human body.

[Capillaries] Related Worksheets and Study Guides:

• The Endocrine system and ReproductionScience • Eighth Grade