Question

How did the circulatory system evolve?

Answer 1

Circulatory system:

1. The circulatory system includes the heart, blood vessels, and blood.
2. The most crucial function of the system is to transport gases such as oxygen and carbon dioxide throughout the body.
3. It delivers nutrients to the cells and tissues and removes the waste generated for disposal.
4. It is also key for thermoregulation.

Evolution of the circulatory system:

1. The circulatory system initially functioned only via simple diffusion and then evolved to form a system of blood vessels that is distributed throughout the body.
2. Evolutionary changes involved the development of a single circuit heart to form a double circuit heart.
3. It evolved to increase the separation of oxygenated and deoxygenated blood and to increase respiratory efficiency.
4. The evolved circulatory system provided increased oxygen delivery and aids in endothermal regulation.