B2

• what are cells

  they are the basic building blocks which make up all living organisms
• What is a tissue

  Group os similar cells working together to carry out a function
• What is an organ 


  An organ is a group of cells working togther to carry out a certain function
• what is an organ system

  group of organs working together to preform a function
• what is an example of an organ system

  digestive system
• What Is the role of the digestive system 


  Breaks down and absors food molecules
• what organs is the digestive system made of


  liver, salivary glands, large intestine, small intestine, stomach, pancreas,
• job of the salivary gland

  produces digestive juices
• job of the liver 


  produces bile
• job of large intestine 


  absorbs water from undigested food, leaving faeces(poo)
• jog of the stomach 


  digest food
• job of the pancreas

  produce digestive juices
• job of small intestine 


  produce digestive juices
• job of small intestine 


  digest food and absorb soluble food molecules
• what is an enzyme

  large protein molecules
• what do enzymes do 


  speed up reactions inside living things by acting as catalyst
• what is a catalyst 


  it is a substance which increases speed of a reaction without it being changed or used up
• what does every enzyme have

  active site
• what 2 things affect enzymes

  temperature and pH
• how does temp affect enzymes

  if temp gets too high bonds holding the enzymes together break which changes the shape of the active site so substrate no longer fits
• define the term denatured 


  active site no longer fits into the substrate
• How does pH affect enzyme activity 


  If it’s too high or too low it affects bonds holding the enzymes together. This changes the shape of the active site and denatures the enzyme
• examples of big molecules

  starch proteins and fats
• example of a carbohydrase

  amylase
• where is analyse made


  salvairy glands, small instetine and pancrease
• where does amylase work

  mouth small intestine
• Where is proteases made

  stomach, pancrease and small intestine
• Where does protease work


  Stomach and small intestine
• where is lipase made


  pancrease and small intestine
• where does lipase work


  small intestine
• where is bile produced

  liver
• where is bile stored 


  gall bladder before relasked into small intestine
• define emulsify 


  breaks down into tiny droplets so there is a bigger surface area for lipase to work on
• where does the air you breath in go through

  tanchea
• where does the air go after passing through tranchea 


  passes through bronchi then bronchioles and the ends up in the alveoli
• awhat does alveoli carry out

  gas exchange
• How does the alveoli carry out gas exchange 


  Alveoli in the lungs are surroundeD by blood capillaries. Blood comes into the lungs through the capillaries and contains lots of co2 and very little o2. Oxygen diffuses out of the air into the alveolus into the blood. CO2 diffuses out of the blood into the air in the alveolus. The blood then leaves and travels around the body
• what is a double circulatory system

  Two circuits joint together
• what happens in the first circuit in the heart


  Heart pumps deoxygenated blood into the lungs. The blood picks up oxygen in the lungs. Oxygenated blood returns back to the heart
• what happens on the second circuit of the heart


  heart pumps oxygenated blood round the other organs on the body. this delivers oxygen to the body cells. deoxygenated blood returns to the heart to be pumped out of the heart agai