Venules

Definition

Venules are small blood vessels that collect blood from capillaries and transport it to larger veins. They play a crucial role in the circulatory system by aiding in the return of deoxygenated blood back to the heart.

5 Must Know Facts For Your Next Test

1. Venules are part of the microcirculation system, linking capillaries to veins.
2. They have thinner walls than arteries, making them more permeable to fluids and cells.
3. Nutrient exchange primarily occurs in capillaries but venules assist in removing metabolic waste products.
4. Inflammatory responses can cause venules to become more permeable, leading to fluid leakage and swelling.
5. Proper nutrition helps maintain the integrity of venule walls, which is essential for cardiovascular health.

Review Questions

• What role do venules play in the circulatory system?
• How do venule walls compare to artery walls in terms of thickness and permeability?
• Why is maintaining the integrity of venule walls important for cardiovascular health?

Related terms

Capillaries: Tiny blood vessels where nutrient and gas exchange occurs between blood and tissues.

Veins: Blood vessels that carry blood toward the heart, receiving it from venules.

Microcirculation: The circulation of blood in the smallest blood vessels, including arterioles, capillaries, and venules.