18:26
Blood Vessels 2, Venous return
21:33
Cardiovascular System 1, Heart, Structure and Function
20:25
Cardiovascular System 5, Arteries and Veins
22:55
Heart 1, Basic structure and blood flows
14:04
Cardiovascular System 7, Circulation of the blood
14:03
Heart 3, Pulmonary and Systemic circulation
13:54
Blood Vessels 3, Capillaries and tissue fluid
15:16