2.2 - pt. 2 hormonal control

• hormonal control


  chemical messages from endocrine glands to regulate physiological processes such as glucose concentration
• glands


  organised collection of specialised cells that secrete chemicals
• endocrine glands


  cells which secretes hormones straight to the bloodstream
• hormones


  chemical messengers
• target tissue


  has cells with complementary receptor proteins for specific hormones so only that tissue can be affected
• pancreas


  makes insulin and glucagon
• ovary


  makes estrogen
• testes


  makes testosterone
• secreting cell


  endocrine gland
• target cell


  specific receptor
• liver


  body's reservoir of glucose molecules stored as glycogen, which can be broken down using glucagon which releases glucose
• concentration of glucose in blood


  regulated by the actions of the hormones, insulin and glucagon, which have target cells in the liver
• high concentration of glucose in blood

  water concentration is low so water diffuses out of the cell via osmosis, interfering with cell reactions
• low concentration of glucose in blood


  body cells will not receive as much glucose so can't release as much energy in respiration