Biology Trilogy

• Homeostasis is...


  ...keeping internal conditions constant
• Homeostasis is achieved by...

  nerves and hormones
• The 3 levels that are controlled by homeostasis are

  blood glucose, blood water and body temperature
• Receptors


  process stimuli
• Processing centre


  receives stimuli and coordinates a response
• Effector


  Causes the reponse
• An Effector can be a

  muscle or a gland
• Nerve cell have a long cell body to

  carry nervous impulses over long distances
• The CNS is made up of

  the brain and spinal cord
• A way to test reaction time is to use the

  ruler drop test
• stimulus --> receptor --> coordinator -->


  effector --> response
• A relay neuron joins a

  sensory neuron and a motor neuron
• A sensory neuron


  What type of neuron is this?

  
• A motor neuron


  What type of neuron is this?

  
• The speed of reflex reactions are


  quick
• Hormones are secreted by

  glands
• Hormones are carried in

  blood plasma
• The speed of hormonal responses is

  slow
• Hormonal responses generally last for a

  long time
• The speed of a nervous response is


  quick
• The gland in the brain that secrets hormones is called the

  pituitary gland
• Pituitary gland


  Which gland is this?

  
• Pancreas


  Which gland is this?

  
• Adrenal


  Which gland is this?

  
• Ovaries


  Which gland is this?

  
• Testes


  Which gland is this?

  
• Thyroid


  Which gland is this?

  
• Which organ monitors blood glucose concentration?

  Pancreas
• Which hormone is secreted when blood glucose is too high?

  Insulin
• Which hormone is secreted when blood glucose is too low?

  Glucagon
• Insulin causes


  more glucose to be taken up by cells and glucose to be turned into glycogen
• Glucagon causes


  Glycogen to be converted to glucose in the liver
• How is glucose stored in the body?

  As glycogen in the liver
• A risk factor for type 2 diabetes is

  obesity
• Type 2 diabetes can be controlled by

  diet
• Type 1 diabetes can be controlled by

  insulin injections
• The term given to when an egg is released from the ovarie

  Ovulation
• How long (approx) is the menstrual cycle?

  28 days
• What does testosterone cause to be produced?

  Sperm
• What does FSH cause?

  An egg to mature in the ovary