Circulatory System.

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Presentation transcript:

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 Vena cava Right atrium Right ventricle Pulmonary Arteries Lungs

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

Influence on Heart Rate Nervous system Hormones

Functions of Blood Transport Immune Response 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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