Biology paper 2

• What is the definition of homeostasis?

  Regulation of internal conditions for optimum function
• Why do enzymes require stable conditions?

  They cannot function well with changing conditions
• What are the three internal conditions maintained by homeostasis?

  Blood glucose concentration, body temperature, water levels
• What are the key features of an automatic control system in the body?

  • Involves nervous system or hormones
  • Detects changes via receptor cells
  • Processes information in a Coordination Center
  • Sends instructions to an effector
  • Maintains optimum internal conditions
• What is a stimulus in the context of homeostasis?

  A change to the environment
• What role do receptor cells play in homeostasis?

  They detect changes in the environment
• What is the function of the Coordination Center?

  Processes information from receptor cells
• What is the role of an effector in homeostasis?

  Carries out the response to maintain balance
• Describe the process of homeostasis in the human body.

  1. Stimulus detected by receptor cells
  2. Information sent to Coordination Center
  3. Coordination Center processes information
  4. Instructions sent to effector
  5. Effector carries out response to maintain balance
• What can the Coordination Center be in the human body?

  Brain, spinal cord, or pancreas
• How does exercise affect homeostasis in the body?

  It can lower blood glucose and raise temperature
• What happens to blood glucose concentration during exercise?

  It can fall due to respiration
• What is the significance of maintaining constant internal conditions?

  It allows cells to function optimally
• How do automatic control systems contribute to homeostasis?

  They ensure internal conditions remain stable