1. The Circulatory System
Parts and Function

2. The 3 main parts of the Circulatory System
The Heart
The Blood Vessels
Blood

3. THE HEART

4. Parts of The Heart The Atria -Receiving Chambers The Ventricles
-Pumping Chambers
The Valves
-Controls Flow
The Septum
-Divides the Heart

5. Cardiac Cycle Systole – contraction of heart muscle
Diastole – relaxation of heart muscle

7. Heart sounds (lub-dup) are associated with closing of heart valves.
First sound occurs as AV valves close and signifies the beginning of systole.
Second sound occurs when SL (semilunar) valves close at the beginning of ventricular diastole.

8. Blood Vessels

9. Types of Blood Vessels Arteries -Carry blood away from the Heart
-The Aorta is the largest artery
Veins
-Carry blood to the Heart
-Veins contain valves
-The Vena Cava is the largest vein
Capillaries
-Known as the “Distribution Pipes”

10. Blood

11. Blood accounts for 8% of body weight.
Its volume in healthy adult males is 5-6 liters.
The blood has many functions:
transports nutrients to cells throughout body
delivers oxygen, removes carbon dioxide
carries hormones
protecting the body from infection

12. The Composition of Blood
The Plasma (Fluid) makes up 55% of the blood volume.
The Solids (Cells) make up 45% of the blood volume.

13. Blood Plasma 97% Water Other 3% -Antibodies and Proteins
- Nutrients and Wastes

14. Blood Solids Red Blood Cells -Carry oxygen -Contain Hemoglobin
White Blood Cells
-Attack bacteria & other invaders
Platelets
-Control the blood clotting process