HOMEOSTASIS:

• Automatic control systems


  • Ensure internal conditions of the body stay as constant as possible
• Homeostasis


  Keeping internal conditions as constant as possible
• Stimulus is a change to the environment detected by receptor cells
• Homeostasis the ability of the body to maintain a stable internal environment despite changes in external conditions
• Internal conditions in the human body

  • Blood glucose concentration, body temperature, water levels
• Automatic control system

  1. Receptor cells detect changes in the environment (internal or external)

  2. Receptor cells pass information to a Coordination Center (e.g., brain, spinal cord, pancreas)

  3. Coordination Center receives and processes information from the receptor cells

  4. Coordination Center sends instructions to the effector (muscle or gland)

  5. Effector carries out the response to restore the optimum level
• Components of an automatic control system

  • Stimulus- information form the environment that the body responds to
  • Receptor cells-group of specialised cells that detect a stimulus and produce and electrical impulse
  • Coordination Centre
  • Effector-parts of the body that produce a response to a detected stimulus such as muscles and glands