Homeostasis-Homeostasis

• What is homeostasis?

  Process of maintaining a stable internal environment despite changing conditions
• Why do cells need certain conditions to function properly?

  For optimal functioning and survival
• What conditions are necessary for a cell to function properly?

  Temperature, pH, glucose, and water
• How does the body maintain a stable internal environment?

  Through regulation of internal conditions
• Do the body's internal conditions remain constant?

  No, they fluctuate within small bounds
• What is the definition of homeostasis?

  Regulation of internal conditions for stability
• What does it mean for homeostasis to respond to internal and external changes?

  Maintaining internal environment despite external changes
• What is the normal human body temperature?

  37 degrees
• How do automatic control systems work?

  Recognize change, send signal, reverse change
• What are the three main components of automatic control systems?

  Receptors, coordination centers, effectors
• What is the role of coordination centers in automatic control systems?

  Interpret change, decide response
• What are effectors in automatic control systems?

  Muscles, glands
• Why are the nervous and endocrine systems necessary?

  To send signals between components
• How does the nervous system send signals?

  Fast, precise electrical impulses
• Why is the nervous system useful for quick responses?

  Allows fast, precise responses
• What are hormones in the endocrine system?

  Small chemicals released into bloodstream
• How do hormones in the endocrine system work?

  Affect specific cells with receptors
• How does the endocrine system compare to the nervous system?

  Slower, longer lasting, more generalized
• What are the components of automatic control systems and how do they communicate?

  • Receptors: detect changes
  • Coordination centers: interpret changes, decide responses
  • Effectors: carry out responses
  • Nervous system: sends fast, precise electrical impulses
  • Endocrine system: relies on hormones, affects specific cells
• What is the mechanism by which automatic control systems work?

  Negative feedback
• How does negative feedback work?

  Decreases high levels, increases low levels
• What happens when a level gets too low in negative feedback?

  Negative feedback increases the level
• How does negative feedback maintain a stable internal environment?

  • Levels get too low: negative feedback increases them
  • Levels get too high: negative feedback decreases them
  • Loop of negative feedback maintains stability
• What happens when you walk into a room that is really cold?

  Receptors detect low temperature, nervous system sends impulses to coordination centers
• What is the role of receptors in detecting changes in temperature?

  Detect changes, send signals to coordination centers
• What is the role of coordination centers in interpreting temperature information?

  Interpret information, send signals to effectors
• What is the role of effectors in responding to temperature changes?


  Carry out responses such as shivering or sweating