Circulatory System Living Environment

1. Function Transport materials Maintain constant body temperature Helps protect body from disease

2. Blood Liquid tissue (connective tissue) 5-6 quarts in adult humans 55% plasma (watery, protein rich substance) and 45% cells

3. Blood Cells A. Red Blood Cells – transport oxygen to cells and takes carbon dioxide away from cells to the lungs Contain hemoglobin – iron containing protein which binds easily with oxygen Also called erythrocytes

B. White Blood Cells Help defend the body against disease Also called leukocytes and phagocytes

C. Platelets Fragments of cells used for clotting

Check for Understanding 1. What blood component is used to help fight infections in the body? What blood component is used to help stop bleeding after an injury? What blood component includes phagocytes? What blood component carries oxygen to cells? What blood component is the watery portion?

4. Blood Vessels A. Arteries – carry blood away from the heart, have elastic, muscular walls that can expand B. Veins – carry blood to the heart, have thinner walls, also have valves to prevent blood from flowing backwards C. Capillaries – where diffusion of materials between the blood and the cells occur, very small, one cell thick

5. Types of Circulation Pulmonary Circulation – between the heart and the lungs Systemic Circulation – between the heart and the rest of the body https://www.youtube.com/watch?v=LqhvmUEdOYY

Heart Diagram Label the diagram of the heart that was provided to you.

Check for Understanding 1. Which type of blood vessels would be used to carry blood from your heart to your leg? 2. What type of blood vessels would return the blood to the heart? 3. What important process occurs in beds of capillaries?