2. Heart and Blood Structures and functions:
Atria (sing = atrium) – receive blood from the body (veins)
Ventricles – pump blood out of the heart via arteries

3. Myocardium – involuntary, striated muscle
Heart Layers
Myocardium – involuntary, striated muscle
Endocardium – innermost layer, develops from endothelial cells that line blood vessels, protects
Epicardium – membrane that forms inner layer of pericardium and outer layer of the heart

4. Blood Vessels:
Arteries – carry blood FROM the heart
Arterioles – smaller, branching vessels from arteries
Capillaries – small, narrow vessels. SIGHT OF DIFFUSION
Veins – carry blood TO the heart
Venules – smaller, branching vessels, collect blood from capillaries and send to veins

5. Diagram Complete the heart diagram and blood flow
If not done, it’s homework.
50 pts