Endocrine system and hormones

• How the endocrine system works :

  1.glands are organs that release small chemicals called hormones.

  2.these chemicals are normally released into the bloodstream, allowing them to travel around the body.

  3.they can bind to specific cells that have the correct receptors.

  4.this will bring about some change within the cells.
• A hormone can only stimulate a cell of the cell has the correct receptor for that hormone.
• Different glands release different hormones.
• Pituitary gland

  Often known as the ‘ master gland ‘.

  Close to the brain.

  Releases multiple hormones.

  The hormones it releases control what other glands do.
• Which gland releases thyroxine?

  Thyroid.
• What is the role of thyroxine?

  It regulates metabolism.
• If the level of thyroxine in the blood is too low, the pituitary gland releases thyroid stimulating hormone (TSH)
• What is the role of adrenaline?


  Stimulates fight or flight response.
• Which organ is adrenaline released from?

  Adrenal glands.
• Which organ is insulin released from?

  Pancreas.
• Sex hormones that stimulate puberty :

  Testosterone

  Oestrogen
• Which organ is testosterone released from?

  Testes.
• Do the effects of the endocrine system or the nervous system last longer?

  Endocrine system.