1. Blood Flow
p.248

2. Blood Pressure Is the force of blood against the blood vessels
Not constant & is greater when ventricles contract
Hypothalamus = part of brain that monitors blood pressure and can cause the arteries to constrict or dilate
2 parts:
Systolic pressure (systole)
pressure when ventricles contract
higher number
given first
2. Diastolic pressure (diastole)
pressure when ventricles are relaxing

3. Blood pressure is measured along a brachial artery
Measured with a sphygmomanometer
120/80 = normal

4. Capillary Tissue Fluid Exchange
At the arteriole end:
Blood pressure > osmotic pressure
So, net fluid movement is from the capillaries into the interstitial (or tissue) fluid
Cells take in O2, glucose, amino acids from tissue fluid

5. Blood pressure = osmotic pressure
At the midpoint:
Blood pressure = osmotic pressure
So, nutrients & wastes move with the concentration gradient
O2 moves into cells & CO2 moves out of cells
At venuole end:
Blood pressure < osmotic pressure
So, net fluid movement is from interstitial tissue into the capillaries
Brings CO2 & wastes into bloodstream
NOTE: any excess fluid in the tissue cells drains into the lymphatic system