1. The Function of Blood

2. The Four Components of Blood
Red Blood Cells
White Blood Cells
Platelets
Plasma

3. Blood is the largest organ in the body (tissue) because it travels throughout the blood vessels.

4. The flow of blood through the body, beginning with the heart is:
Aorta
Arteries
Arteriole
Capillary*
Venuoles
Vein
Vena cava

5. Blood has 7 Functions
1. Maintains Homeostasis — helps keep pH and temperature at ideal level.
2. Regulate Temperature — distributes heat to every area of the body
3. Maintain pH — has buffers that keep pH at ~7.4and keeps fluid and electrolytes balanced
4. Hormone Transport — to organs where they serve as signals that influence cellular metabolism

6. Blood has 7 Functions
5. Helps Fight Infection — white blood cells identify and destroy invaders
6. Gas and Nutrient Transport — Brings O2 & sugars to cell and take CO2 & waste away
7. Prevents Hemorrhage — platelets form clots in damaged areas

7. The pumping of the heart sends blood via arteries towards the capillaries where gas/nutrient exchange takes place across the thin capillary walls.
Capillary is the smallest of all vessels composed of only 1 layer of epithelial cells. (Very Fragile)

8. (force caused by uneven solute conc.) (created by heart pumping)
Capillary Exchange
Osmotic pressure
(force caused by uneven solute conc.)
Blood Pressure
(created by heart pumping)
ARTERIOLE
VENUOLE
salt
water
oxygen
sugar
CO2
water
Nitrogenous Wastes

9. Questions
What drives nutrients/oxygen to diffuse out of the capillary on the arteriole end?
Blood pressure
What drives the waste products in the cell to diffuse into the capillary on the venous end?
Osmotic pressure