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Understanding Circulatory System Function and Blood Pathways

Learn about the vital functions of the circulatory system, including the transport of gases, nutrients, and wastes, distribution of hormones, and blood's pathway through the heart. Explore how the heart functions, its influence on heart rate, blood composition, and the roles of blood vessels in maintaining circulation.

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Understanding Circulatory System Function and Blood Pathways

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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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