Module 8: The structure and function of the cardiovascular system

The Body in Action

1. Introduction to the cardiovascular system
2. The heart
   1. Structure of the heart
   2. The heart valves
3. Labelling the heart activity
4. Circulatory system
   1. Animation of the circulation systems
5. Blood vessels
   1. Arteries
   2. Capillaries
   3. Veins
6. Characteristics of blood vessels activity
7. Function of the cardiovascular system
8. Function of the blood

Capillaries

Capillaries are the essential link between arterioles and venules. They are found in all parts of the body and allow the exchange of materials between the blood and tissues take place, this process is known as tissue diffusion. Diffusion of gases (oxygen and carbon dioxide) and nutrients can occur easily in the capillaries as they are only one cell thick and have a semi permeable membrane.