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Circulatory System

Explore the functions and components of the circulatory system including the heart, blood, arteries, veins, and capillaries. Learn about red and white blood cells, platelets, plasma, and the vital role of hemoglobin. Understand blood pressure and its impact on overall health.

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Circulatory System

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  1. Circulatory System

  2. Circulatory System • The overallfunction of the circulatory system is to transport substances throughout the body • The circulatory system is composed of the heart, blood, and blood vessels

  3. Lungs • Heart • Arteries • Veins • Capillaries

  4. Veins • Carry deoxygenated blood from the body back to the heart, or from the heart to the lungs to pick of more oxygen

  5. Arteries • Carry oxygenated blood from the heart to the rest of the body, or from the lungs to the heart

  6. Capillaries • Thin-walled blood vessels between arteries and veins where gas exchange takes place.

  7. Heart • The heart acts as a pump, pumping blood through the blood vessels to all parts of the body

  8. Blood • A type of connective tissue • Blood transports oxygen and nutrients to cells • Removes wastes from body cells, such as CO2

  9. Components of Blood • Blood is made up of four different substances: • red blood cells • white blood cells • platelets • plasma

  10. White Blood Cells • Make up only 1% of the volume of blood • Function: fight and destroy disease-causing bacteria and viruses

  11. Red Blood Cells • Make up half of the volume of blood • Bright red • No nuclei • Function: contain hemoglobin, a molecule that picks up and carries oxygen and carbon dioxide throughout the body

  12. Plasma • Makes up half of the volume of blood • Liquid portion of the blood • Function: carries blood cells, dissolved wastes, nutrients, and hormones

  13. Platelets • Small cells • Make up less than 1% of the volume of blood • Function: help the blood to clot, seal wounds, and stop bleeding

  14. Hemoglobin • The molecule in red blood cells that holds oxygen and carbon dioxide so that it can be transported

  15. Blood Pressure • Blood pressure is the pressure, or force, of the blood pushing on the walls of the blood vessels

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