Blood Vessels - Capillaries
Biology: Edexcel IGCSE, topic 3.3.20
Capillaries
Arteries branch into much smaller vessels, called capillaries. Capillaries have thin walls and pass very close to the body cells. This means that there can be an efficient exchange of:
Food and oxygen
- In capillaries, food and oxygen moves out of the blood and into the cells.
Waste products
- In capillaries, waste products, such as carbon dioxide, move out of the cells and into the blood.
Test yourself on Blood Vessels - Capillaries
Which of the following is an example of a waste product that moves into the blood in capillaries?
What do arteries branch into?
What would happen if capillaries had thicker walls and lower surface areas?