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3 Cards in this Set

  • Front
  • Back

how does blood flow to the heart

Blood enters via the vena cava then flows to the right atrium it then goes down through the valve which is specialised to stop blood backflow, then the blood will flow through the right ventricle to be passed into the lungs by the pulmonary artery. The oxygenated blood will reenter the heart via the pulmonary vein then it will go through the left atrium to the valve then to the left ventricle to be passed onto the rest of the body via the aorta. Left side needs to have a bigger muscle that the right because it is pumping blood around to the whole body down to the toes so it needs to have enough pumps for this whereas the right is only pumping blood to the lungs

Digestive system acting on food to break it down

Teeth - breaking down the food by chewing


Stomach - churns the food up (amylase-turns carbs into sugars) (lipase- turns fats into fatty acids) (protease-proteazs into amino acids) produced in the pancreas


Amylase acts in the mouth and small intestine


Protease acts in the stomach and small intestine


Lipase acts in small intestine


Bile produced in liver and stored in bile duct - neutralises stomach acid so it doesn’t damage small intestine


It will then move through the small intestine tobe absorbed then the large intestine where the water will be re absorbed.

Describe how the structure of intestine is adapted

Small intestine- absorbs all the food only very small food molecules can pass from the si into the blood stream so they need to be broken down by enzymes


Thin walls so the food can easily pass through the blood


Very large blood supply to carry it to the rest of the body


Villi- large surface area more food can pass through


Large intestine - re absorbs water