B3

• Where is adrenaline produced?

  Adrenal gland
• What does adrenaline do

  Prepares body for intense action
• Where is thyroxine produced?

  Thyroid gland.
• What does thyroxine do?


  Regulates metabolism
• What is FSH?


  Follicle-stimulating hormone.
• What does oestrogen do?

  Thickens uterus lining
• What do endocrine glands do?

  Secrete hormones into blood
• What is geotropism?


  growth or movement of an organism in response to gravity.
• What is phototropism? 


  growth or movement of an organism in response to light.
• What are auxins?


  Plant hormones that regulate growth and development
• What does gibberellin do?

  Controls growth of the stem by promoting cell elongation between the nodes
• What does ethene do?

  Promotes ripening of fruit and flower and formation by shedding plant leaves
• What is a parthenocarpic fruit?

  Natural or artificial production of a fruit that makes it seedless and can last longer on shelves
• How can auxins be used as weed killers?

  They make the weed grow too quick
• How can oestrogen be used as a contraceptive?

  If high levels are produced it inhibits production of FSH
• How can progesterone be used as a contraceptive?


  It causes thick, sticky mucus to be produced at cervix which prevents sperm from reaching egg
• Two different contraceptives?


  Condoms and birth control pill
• What is in the CNS?

  The brain and spinal cord.
• What is in the PNS?


  All other nerve cells
• Which way do impulses in motor neurons travel

  Away from cell body
• What way do impulses in relay neurones travel?

  First towards and then away from cell body
• Which way do impulses in sensory neurones travel

  Towards cell body
• Order of a reflex arc?

  Stimulus, Receptor cells, Sensory neurone, Spinal cord, motor neurone, effector, response
• Hypothalamus


  Regulates temperature and water balance
• Pituitary gland


  Stores and releases hormones
• Cerebrum

  Controls complex behaviour e.g. memory and learning
• Cerebellum


  Controls posture, balance and involuntary movements
• Medulla


  Controls automatic actions e.g. heart rate and breathing rate
• Cornea 


  Transparent layer at front of eye
• Iris


  Coloured part that opens and closes pupil
• Pupil

  Hole that lets light into eye
• Lens

  Focuses light onto retina
• Retina


  Changes light into electrical signals
• Optic nerve

  Sends signal to brain
• Ciliary body and suspensory ligament

  Controls shape of lens
• What is short sightedness?


  Cant focus on objects far away
• How to correct short sightedness?


  Wearing concave lenses
• What’s wrong with someone eye if they have short sightedness?


  Too long
• What’s wrong with someone eye if they have long sightedness?


  Too short
• What is long sightedness?


  Can‘t focus on objects close up