Unit4- 5.8~ The concept of homeostasis

Question 1

What is homeostasis?

Answer 1

The process by which the body maintains a stable internal environment, even when external conditions change.

Question 2

What is maintained by homeostasis?

Answer 2

• Temperature
• Oxygen levels
• Water levels
• Tissue Fluid
• Composition

Question 3

Why is homeostasis important?

Answer 3

• Independence: Stops organisms being reliant on external environment
• Enzymes: Speed up chemical reactions in the body, or maintains a constant internal environment
• Blood glucose: The process that keeps blood sugar levels stable in response to internal and external changes

Question 4

Control mechanisms

What are the stages of homeostatic control?

Answer 4

• The set point (The norm)
• Receptor (Detects variations)
• Controller (Co-ordinates info and send instructions)
• Effector (Brings about changes)
• Feedback loop (Tells receptor about the changes)