6.4.1 Principles of Homeostasis

• Homeostasis ensures the organism can adapt to changes in the external environment.


  True
• What is the purpose of homeostasis?

  Ensure optimal internal conditions
• Positive feedback is a homeostatic mechanism where the response to a stimulus amplifies the original stimulus
• The effector in a homeostatic mechanism restores the internal environment to its normal state.
• What is the first step in a positive feedback loop?

  Stimulus
• Match the positive feedback mechanism with its outcome.

  Blood Clotting ↔️ Formation of a clot to stop bleeding

  Childbirth ↔️ Increased uterine contractions to expel the baby
• Homeostasis maintains the internal environment within a narrow range.
• Why is homeostasis crucial for an organism's survival?

  Maintains optimal conditions
• What is the role of the receptor in a homeostatic mechanism?

  Detect changes
• In temperature regulation, the hypothalamus serves as the control center.
• Match the component of a negative feedback loop with its description.

  Receptor ↔️ Detects deviations from the normal range

  Control Center ↔️ Processes information and initiates response

  Effector ↔️ Executes the response to restore balance
• What is the receptor in temperature regulation?

  Temperature-sensitive neurons
• What are the effectors in temperature regulation?

  Sweat glands and blood vessels
• Positive feedback contrasts with negative feedback, which aims to maintain a stable internal environment
• In a positive feedback loop, the effector reduces the original stimulus.

  False
• During childbirth, uterine pressure receptors detect the onset of labor
• Match the mechanism with its stimulus and effector:

  Blood Clotting ↔️ Injury to blood vessel, Platelets

  Childbirth ↔️ Onset of labor, Oxytocin-producing cells
• The control center for temperature regulation is the hypothalamus
• Glucagon stimulates the liver to release glucose when blood sugar drops.


  True
• Homeostatic mechanisms maintain the body's internal conditions within a narrow range
• Receptors, control centers, and effectors work together in homeostatic mechanisms.


  True
• Homeostasis allows organisms to adapt to changes in the external environment
• Key functions of homeostatic balance

  1️⃣ Maintains optimal conditions for cells

  2️⃣ Allows adaptation to external changes

  3️⃣ Ensures survival and proper functioning
• Homeostasis includes examples such as temperature regulation, blood sugar regulation, and pH control.


  True
• Homeostasis is the process by which the internal environment of an organism is maintained within a narrow range
• The control center in a homeostatic mechanism processes information and determines the appropriate response
• Steps of a negative feedback loop

  1️⃣ Receptor detects a change

  2️⃣ Control center initiates response

  3️⃣ Effector restores normal conditions
• What does the control center initiate in a homeostatic mechanism?

  Corrective response
• Positive feedback is a homeostatic mechanism that reduces the original stimulus.

  False
• Arrange the steps of a positive feedback loop in the correct order.

  1️⃣ Stimulus

  2️⃣ Receptor

  3️⃣ Control Center

  4️⃣ Effector

  5️⃣ Outcome
• Why is positive feedback less common than negative feedback?

  Destabilizes internal environment
• The body regulates temperature to keep it near 37°C despite external changes.


  True
• Match the importance of homeostasis with its description.

  Maintains optimal conditions ↔️ Ensures cells and tissues function properly

  Regulates internal environment ↔️ Adapts to external changes

  Ensures survival ↔️ Maintains proper organism functioning
• The control center processes information and determines the appropriate response in a homeostatic mechanism.

  True
• Arrange the steps of a negative feedback loop in the correct order.

  1️⃣ Receptor detects a change

  2️⃣ Control Center processes information

  3️⃣ Effector implements response
• What is the effector in temperature regulation when body temperature rises?

  Sweat glands
• The control center for temperature regulation is the hypothalamus
• When body temperature rises, the hypothalamus triggers effectors to cool the body.


  True
• Steps of a positive feedback loop

  1️⃣ Stimulus

  2️⃣ Receptor detects stimulus

  3️⃣ Control Center processes information

  4️⃣ Effector enhances stimulus

  5️⃣ Outcome: stimulus increases until interrupted
• What is an example of positive feedback in blood clotting?

  Injury to a blood vessel