hormonal control

• What is the endocrine system

  • a system made from glands to produce hormones
• what is the pituatry gland

  • main gland
  • produces hormones that tell the body what to do and also hormones that control other glands
• what does the thyroid gland do

  • increases the amount of thryoxine in the blood which regulates metabolism
• what does the adrenal glands do

  • produce adrenaline for the body in a "fight or flight response"
• What are the testes

  • only present in men
  • control the hormones in men (testerone) and also control male games
• what aree the ovaries

  • only in woman
  • control the gametes in woman and produce oestrogen
• What are the differences between the endocrine and nervous system

  • endocrine system - produces hormones.slower responses,hormones travel through the blood to target hormones
  • nervous system - produce impulses,faster response and travel through nerve cells to effector muscle
• name four effects of adrenaline on the body

  • increase heart rate
  • increased blood pressure
  • blood flow to muscles and controlling blood glucose levels
• How does adrenaline increase heart rate and blood pressure

  • produced by adrenal glands and secreted in the blood
  • adrenaline binds to specific receptors in the heart
  • causes heart to contract more frequently and with more force so blood pressure increaze and heart rate increase
• How does adrenaline increase respiration in the muscle tissue

  • binds to receptors on the liver
  • breakes down glycogen stores into glucose
  • increasing blood glucose levels and greater blood flow means more flow to muscles
  • muscles cells uses glucose and oxygen for respiration
• what is negative feedback

  • a corrective mecha ism that only allows small shifts from a certain point by reversing a change in conditions
• where is the thryoid gland located

  in the neck
• How does the body response to a low amount thyroxine

  • the hypothalamus stimulates the release of trh (thryotropin releasing hormone)
  • tsh stimulates the pituitary gland to tsh (thryxoine stimulating hormone)
  • stimulates the thryroid glands to stimulates thryxoine and increases the metabolic rate and blood thryxoine levels
• What happens if there's too much thryxoine in the blood

  • the tsh and thr release are inhibited by the hypothalamus meaning less thryoxine is produced by the thryoxine gland it drops back to normal
• how do the testes and ovaries act as a endocrine gland

  testes - release testrone in the blood

  ovaries - release oestrogen inside the blood