Homeostasis

• What is the definition of homeostasis?

  Homeostasis is the regulation of the internal conditions of a cell or organism to maintain optimum conditions for function in response to internal and external changes.
• Why do enzymes and cells require stable conditions?

  Enzymes and cells cannot work well if the conditions around them change too much.
• What are the key internal conditions that homeostasis regulates in the human body?

  • Blood glucose concentration
  • Body temperature
  • Water levels
• What is an automatic control system in the human body?

  An automatic control system is a system that keeps the internal conditions of the body as constant as possible.
• What are the two systems that can be involved in automatic control systems in the human body?

  The nervous system and hormones.
• What do receptor cells do in an automatic control system?

  Receptor cells detect changes in the environment.
• What is a stimulus in the context of homeostasis?

  A stimulus is a change to the environment that is detected by receptor cells.
• What role does the Coordination Center play in an automatic control system?

  The Coordination Center receives and processes information from the receptor cells.
• What is an effector in the context of homeostasis?

  An effector is a muscle or gland that carries out the response to maintain optimum levels.
• What are the components of an automatic control system in homeostasis?

  1. Stimulus

  2. Receptor

  3. Coordination Center

  4. Effector

  5. Response
• What happens to blood glucose concentration during exercise?

  Blood glucose concentration can fall due to respiration using glucose to generate energy.
• How does exercise affect body temperature?

  Exercise causes the athlete's body temperature to rise.
• What is one way the body loses water during exercise?

  The body loses water through sweating.
• Where can you find additional questions on homeostasis?

  In the vision workbook linked in the video.
• Homeostasis is the maintenance of internal conditions within an organism.
• The nervous system controls homeostatic mechanisms through reflexes, which are rapid responses to stimuli without conscious thought.
• Reflex arcs consist of sensory neurons that carry information from receptors to the central nervous system (CNS), interneurons that process and integrate signals, and motor neurons that transmit impulses to effector organs such as muscles or glands.
• Negative feedback mechanisms maintain homeostasis by detecting changes from normal levels, sending signals to correct them, and returning to normal levels.
• Positive feedback mechanisms amplify or exaggerate changes from normal levels until they reach extreme values.