5.1.1 Defining Homeostasis

• Homeostasis refers to the regulation of the internal environment to maintain stable and optimal conditions
• Maintaining homeostasis is crucial for an organism's survival and proper functioning.

  True
• What does the term 'regulation' refer to in homeostasis?

  Control of internal conditions
• An example of homeostasis in humans is the regulation of body temperature
• Homeostatic systems maintain stable internal conditions.


  True
• Order the key differences between internal and external environments:

  1️⃣ Stability

  2️⃣ Control

  3️⃣ Purpose
• The internal environment is highly stable, whereas the external environment fluctuates
• Homeostatic equilibrium is maintained by responding to changes in internal conditions.

  True
• What is an example of a homeostatic system maintaining equilibrium?

  Body temperature regulation
• Non-homeostatic systems do not actively regulate internal conditions
• Homeostatic systems actively maintain a constant internal state.


  True
• Boiling water in a kettle is an example of a homeostatic system.

  False
• Match the system type with its characteristic:

  Homeostatic ↔️ Maintains a stable internal environment

  Non-homeostatic ↔️ Allows internal conditions to fluctuate
• Match the system with its example:

  Homeostatic ↔️ Body temperature regulation

  Non-homeostatic ↔️ Boiling water in a kettle
• What is a characteristic of non-homeostatic systems?

  Conditions may fluctuate
• Homeostasis ensures that the body's cells and tissues operate under the right conditions
• What does the internal environment include in an organism's body?

  Blood and lymph
• Homeostasis refers to the regulation of the internal environment to maintain stable and optimal conditions
• Homeostatic systems maintain a stable internal environment
• Why is maintaining homeostasis crucial for an organism's survival?

  Ensures proper cellular functioning
• The external environment is tightly controlled by the organism.

  False
• In homeostasis, equilibrium refers to the stable, optimal state maintained in an organism's internal environment
• Match the factor with its homeostatic regulation:

  Body Temperature ↔️ Sweating and shivering

  Blood pH ↔️ Buffers and respiratory mechanisms

  Blood Glucose Levels ↔️ Insulin and glucagon
• In negative feedback, the system responds to counteract the initial change
• Why are negative feedback mechanisms crucial for maintaining homeostasis?

  Detect deviations and restore balance
• What is the average internal body temperature maintained through homeostasis in humans?

  37°C
• The internal environment includes fluids like blood and lymph
• What is the definition of the internal environment?

  Inside the organism
• Non-homeostatic systems respond to changes to maintain a narrow range of conditions.

  False
• What is the normal range for blood glucose levels in humans?

  4-7 mmol/L
• Positive feedback is more common in homeostatic systems than negative feedback.

  False