biology 🥬

• the function of the small intestine is to absorb nutrients from food
• the anus allows faeces out of the body
• what are excreted from human body?

  water, urea, co2
• word eq for anaerobic respiration?

  glucose -> alcohol + carbon dioxide
• which structure can reduce how much light enters the eye

  iris
• what gland controls every hormone?

  pituitary gland
• give two functions of myelin sheath

  • speed up nerve impulse transmission
  • insulate the axon
• give two differences between a reflex action and a voluntary action


  • reflex action is quick while voluntary action is slower
  • reflex action is caused by receptors while voluntary action is caused by brain
• explain what happens when you touch a hot pan

  1. heat stimulates receptors on skin, producing an impulse
  2. sensory neurone transmits impulse to spinal cord
  3. impulse transmitted to relay neurone across synapse
  4. impulse travels to motor neurone
  5. motor neurone transmit impulse to effector
  6. muscles contract, causing hand to pull away
• what are the functions of rods in the retina?


  • enable us to see in dim light
  • only in black and white