Circulatory System - Fish & Mammals

Fish -

1. 2 chambered heart
2. Single circulation

Mammals -

1. 4 chambered heart
2. Double circulation

Advantages Of Double Circulation -

1. More efficient blood supply to rest of the body
2. Maintenance of a high metabolic rate
3. Higher pressure in body
4. More time for gas exchange
5. oxygenated deoxygenated separated

Heart Structure -