1. Circulatory System

2. Functions Transport oxygen and carbon dioxide Distribute nutrients
Transport wastes
Distribute hormones
Regulate body temperature

3. The Heart Cardiac cycle Systole – ventricle contraction
Diastole – relaxation of all chambers following contraction of atria

4. Blood’s Path Through the Heart - Deoxygenated
Vena cava
Right atrium
Right ventricle
Pulmonary Arteries
Lungs

5. Blood’s Path Through the Heart - Oxygenated
Lungs
Pulmonary Veins
Left atrium
Left ventricle
Aorta
Body

6. Influence on Heart Rate
Nervous system
Hormones

7. Functions of Blood Transport Immune Response Nutrients Gasses Hormones
Waste Products
Immune Response

8. Blood Composition Plasma 55-60% Red blood cells – carry oxygen
White blood cells - immunity
Platelets – clotting
***Blood is mostly saltwater!***

9. 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