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Circulatory System

Circulatory System. 7 th Grade Science 2013. Objective. SWBAT identify the components of blood and relate them to their functions. Today is not for the weak of heart…. The circulatory system is composed of the heart and blood vessels . Heart = Key organ of the circulatory system.

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Circulatory System

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  1. Circulatory System 7th Grade Science 2013

  2. Objective • SWBAT identify the components of blood and relate them to their functions.

  3. Today is not for the weak of heart… • The circulatory system is composed of the heart and blood vessels. • Heart = Key organ of the circulatory system

  4. Function of the Circulatory System • Carries material and nutrients around our bodies. • Blood goes from the heart, around the body and back again.

  5. Blood: Definition and Function • Blood: connective tissue that flows through blood vessels • Carries oxygen, nutrients , and carbon dioxide to cellsthroughoutyour body.

  6. Plasma • Clear mixture of water, minerals, nutrients, proteins, other substances • Fluid part of blood that carries other cells

  7. Red Blood Cells (RBCs) • Carry oxygen to all cells in your body • Most common type of blood cell • Contain hemoglobin, which clings to oxygen molecules • Red blood cells are why blood looks red

  8. White Blood Cells (WBCs) • Destroy pathogens (bacteria, viruses, etc. that make you sick) by hunting them or using antibodies • Destroy dead or damaged body cells. • Fight off disease and keep you healthy.

  9. Platelets • Produced in bone marrow • Main function: Clump together to force blood to clot; to stop bleeding • 20% of the diameter of red blood cells

  10. Check For Understanding

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