1. BLOOD FLOW

2. REGULATING BLOOD FLOW
The muscles in the middle layer of the artery contract and relax to control the blood flow to organs and tissues.
-Arteries Contract Openings become smaller, blood flow decreases
-Arteries Relax  Opening becomes larger, blood flow increases

3. REGULATING BLOOD FLOW
-EX: After you eat, the stomach and intestines need more blood to help power digestion, arteries near the stomach will relax and become larger.
When you began to run, the muscles need blood, muscle arteries relax, the stomach arteries will now contract to decrease blood flow.

4. PULSE Artery rising and falling repeatedly.
Expansion and relaxation of the artery wall.
When the ventricle contracts, they send a spurt of blood out through all the arteries in your body. As this spurt travels through the arteries. It pushes the artery walls and makes them expand.
After the spurt passes, the artery walls become narrower again.

5. PULSE
When you count the number of times an artery pulses (blood spurts) beneath your finger, you are counting heartbeats.
By taking your pulse rates. You can determine how fast your heart is beating.

6. BLOOD PRESSURE
The pressure blood makes when pushing against the walls of blood vessels.
The force with which the ventricles contract causes blood pressure.
As blood moves away from the heart, the blood pressure decreases.
Blood pressure is highest in arteries, lowest in veins.

7. MEASURING BLOOD PRESSURE
Blood pressure is measured with an instrument called a sphygmomanometer.
Blood is recorded with two numbers
The first number is the pressure when the ventricles contract and pump blood into the arteries.
The second number measures the pressure while the ventricles relax between heartbeats.
A “normal” blood pressure is 120/80

8. HEART BEAT
A healthy heart makes a lub-dub sound with each beat. This sound comes from the valves shutting on the blood inside the heart.
The first sound (the lub) happens when the bicuspid and tricuspid valves close.
The next sound (the dub) happens when the aortic and pulmonary valves close after the blood has been squeezed out of the heart.