Circulatory system

Adjunto:

• Blood vessels

1. heart
   1. is splint by a wall (septum) down the middle
      1. Left
         1. pumps oxygenated blood all around the body
      2. Right
         1. pumps deoxygenated blood to the lungs
   2. thick muscle
   3. contract (beat) 70x a minuet
      1. this forces blood out of the heart into blood vessels
   4. exercise
      1. Increases heart rate
         1. pump more blood for muscle cells to produce energy
   5. pump that keeps blood moving
   6. What can go wrong with the heart?
      1. coronary vessels get blocked/damaged
         1. this stops the heart...
            1. receiving food and oxygen
               1. this causes a heart attack
            2. getting rid of waste products
         2. more likely if the person...
            1. has a bad diet
               1. is overweight
                  1. does not exercise regularly
                     1. smokes
   7. pulse metre
2. 1. tubes that carry blood around the body
   2. pulmonary artery/veins opposite (oxygen)

1. Food substances & oxygen diffuse into the body cells
2. Waste products (e.g carbon dioxide) move from the body cells into the blood