∞ generated and posted on 2016.03.26 ∞
The beating of the heart is the means by which blood is pushed through blood vessels.
| The heart consists of ventricles, atria, heart valves, and multiple layers of tissue including, going from inside to outside, the endocardium, myocardium, epicardium, and the rest of the pericardium. |
The above video considers circulatory systems as seen in a diversity of animals; a fair amount of the emphasis is on the heart but it does present the true distinction between what is an artery and what is a vein, and a focus on blood and blood vessels themselves begins at 5:58 and then returns to consideration of the heart again at 8:17.
The above video provides a nice introduction to both the respiratory system and cardiovascular system.