the endocrine system

• Endocrine system


  A network of glands throughout the body.

  Secretes hormones (chemical messengers) which travel through the bloodstream to the target cells.
• Pituitary gland


  Controls release of hormones from other glands, known as the Master gland.

  Hormones - ACTH
• Hypothalamus


  Links the nervous system to the endocrine system in combination with pituitary. Maintains homeostasis of bodily systems.

  Hormone - CRH
• Pancreas


  Regulates blood sugar levels, problems with this system leads to diabetes.

  Hormones - Insulin and Glucagon
• Adrenal glands


  Plays an important role in the fight or flight process.

  Adrenal medulla - releases adrenaline and noradrenaline - helps the body to respond to stressful situations.

  Adrenal cortex - releases cortisol that regulates important bodily functions and increases glucose in blood stream.
• Ovaries


  Secretes female sex hormones.Releases oestrogen and progesterone that are involved in the menstrual cycle.Oestrogen regulates growth and development.Progesterone helps prepare the body for pregnancy.
• Testes


  Secretes male sex hormones. Releases testosterone that regulates libido, production of sperm and causes male characteristics to develop (e.g. voice deepening, facial hair).
• Thyroid gland


  Regulates growth, metabolism and appetite.

  Hormone - Thyroxine
• Parathyroids


  A small paired endocrine gland found in the thyroid gland.

  Helps regulate the level of calcium in the blood.