GCSE AQA BIOLOGY PAPER 2
HIGHER TIER
[Document subtitle]
[DATE]
[COMPANY NAME]
[Company address]
, Certainly! Here's a numbered list of all your questions with summarized answers:
1. **What is homeostasis?**
The regulation of internal conditions of a cell or organism in response to internal and
external changes.
2. **Why is homeostasis important?**
It maintains constant conditions for optimal enzyme activity and cell functions.
3. **What does homeostasis include the control of?**
Blood glucose, body temperature, water, and ion levels.
4. **What may automatic control systems involve?**
Electrical responses via the nervous system and chemical responses via hormones.
5. **What do control systems include?**
Receptors (detect stimuli), coordination centres (brain, spinal cord, pancreas), effectors
(muscles/glands).
6. **What is a negative feedback system for blood sugar?**
Receptors detect changes, the brain compares to a set point, insulin or glucagon is
released to restore normal levels.
7. **What is the endocrine system?**
Glands that secrete hormones directly into the bloodstream to regulate functions.
8. **Main glands producing hormones?**
Pituitary, thyroid, adrenal, pancreas, ovaries, testes.
HIGHER TIER
[Document subtitle]
[DATE]
[COMPANY NAME]
[Company address]
, Certainly! Here's a numbered list of all your questions with summarized answers:
1. **What is homeostasis?**
The regulation of internal conditions of a cell or organism in response to internal and
external changes.
2. **Why is homeostasis important?**
It maintains constant conditions for optimal enzyme activity and cell functions.
3. **What does homeostasis include the control of?**
Blood glucose, body temperature, water, and ion levels.
4. **What may automatic control systems involve?**
Electrical responses via the nervous system and chemical responses via hormones.
5. **What do control systems include?**
Receptors (detect stimuli), coordination centres (brain, spinal cord, pancreas), effectors
(muscles/glands).
6. **What is a negative feedback system for blood sugar?**
Receptors detect changes, the brain compares to a set point, insulin or glucagon is
released to restore normal levels.
7. **What is the endocrine system?**
Glands that secrete hormones directly into the bloodstream to regulate functions.
8. **Main glands producing hormones?**
Pituitary, thyroid, adrenal, pancreas, ovaries, testes.
