homeostasis

• What is the definition of homeostasis?

  →Regulation of internal conditions of an organism / cell (in response to internal / external changes)

  →To maintain optimum conditions for functions
• Why is homeostasis important for organisms?

  To maintain optimum conditions for enzyme action and all cell funtions
• Name three conditions regulated in the human body.

  Blood glucose levels, body temperature, water levels
• What are the components of automatic control systems in homeostasis?

  1. Receptor cells (e.g., temperature receptor) → Detect a stimulus(change in environment)
  2. Coordination centre (e.g., brain, spinal cord, pancreas)→ Recieve and process information from receptors
  3. Effectors (muscles or glands)→ Bring about responses to restore optimum levels
• How do receptor cells function in homeostasis?

  They detect a stimulus in the environment
• What role does the coordination centre play in homeostasis?

  It receives and processes information from receptors
• What do effectors do in the homeostasis process?

  They bring about responses to restore optimum levels
• What is a common misconception about effectors?

  An effector detects a stimulus
• Why should body temperature not increase significantly?

  Enzymes become denatured at high temperatures
• Outline the stages in the negative feedback mechanism when blood pressure is too high.

  Receptors detect high blood pressure, signal coordination centre, effector responds