Assessing your learning
Test your understanding of the human circulatory system.
1. The circulatory system mainly transports:
2. The main organ that pumps blood in the body is the:
3. Blood vessels that carry blood away from the heart are called:
4. Blood vessels that carry blood back to the heart are called:
5. The smallest blood vessels where exchange of substances occurs are:
6. Red blood cells mainly transport:
7. White blood cells help the body to:
8. Platelets mainly help in:
