Circulatory System
Functions
• Transport oxygen and carbon dioxide
• Distribute nutrients
• Transport wastes
• Distribute hormones
• Regulate body temperature
The Heart
Cardiac cycle
Systole – ventricle contraction
Diastole – relaxation of all chambers following contraction of atria
Blood’s Path Through the Heart - Deoxygenated
1. Vena cava
2. Right atrium
3. Right ventricle
4. Pulmonary Arteries
5. Lungs
Blood’s Path Through the Heart - Oxygenated
6. Lungs
7. Pulmonary Veins
8. Left atrium
9. Left ventricle
10. Aorta
11. Body
Influence on Heart Rate
• Nervous system
• Hormones
Functions of Blood
• Transport– Nutrients– Gasses– Hormones– Waste Products
• Immune Response
Blood Composition
• Plasma 55-60%
• Red blood cells – carry oxygen
• White blood cells - immunity
• Platelets – clotting
***Blood is mostly saltwater!***
Blood Vessels
• Arteries/arterioles – have smooth muscle in walls, take blood away from the heart
• Capillaries – very small, place where most gas exchange occurs
• Veins/venules – have valves, no muscle, take blood toward the heart
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