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Circulatory System

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.

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Circulatory System

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  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 • 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

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