1. Mammalian Blood
Vessels

2. Arteries Muscular vessels that always carry oxygenated blood away from
the heart, with the exception of the pulmonary arteries that
always carry deoxygenated blood from the heart to the lungs.

3. Different Types of Arteries:
Aorta
largest artery in the body
moves blood at 1.6 km/h
Arterioles (smaller arteries)
no thicker than a hair
Carry oxygenated blood from
arteries to capillaries

4. Capillaries carry oxygenated blood
microscopic, 1 cell thick, leaky blood vessels which allow gases and fluids to exit and enter (red blood cells (RBC) are too big to pass)

5. so small that only one RBC can pass at a time
capillaries are no further than 50 microns away from any cell
Arteriole
Capillary
Artery

6. Capillaries:

7. Vena Cava the largest of the veins in the body
it takes all the deoxygenated blood and dumps it into the right atrium

8. Veins carry deoxygenated blood to the vena cava
have many one-way flap-like valves that carry blood back to the heart

9. - Carry deoxygenated blood back to the veins
Venules
- Carry deoxygenated blood back to the veins

10. Path of Blood Flow: Vena Cava Aorta Veins Arteries Venules Arterioles
Capillaries