Homeostasis

Question 1

Why does our body need regulation?

Answer 1

• All cells in our body need certain conditions to function corectly
• To achieve this, the body regulates all conditions

Question 2

Are body conditions always kept constant

Answer 2

• No, they are kept within small bounds (fluctuation is constant)

Question 3

What is homeostasis

Answer 3

• The regulation of conditions inside the body to maintain a stable internal environment

Question 4

What does the automatic control system do?

Answer 4

• Change from optimal condition sends a signal which then reverses the change

Question 5

How does the automatic control system work?

Answer 5

• Receptors detect the change
• The central nervous system (CNS) interprets the change and figures out what needs to be done
• The effectors carry out the effect

Question 6

Name 2 effectors and how they work

Answer 6

• Muscles: contract and relax
• Glands: release hormones

Question 7

What is the central nervous system?

Answer 7

• The brain and the spinal cord

Question 8

How do the automatic control systems communicate with eachother?

Answer 8

• Via signals
• These signals are sent via the nervous system or the endocrine system

Question 9

Nervous system VS endocrine system

Answer 9

• Nervous system is faster, more precise, uses electrical impulses through nerves and allows for immediate responses
• The endocrin system is slower, longer-lasting, more generalised and sends signals via hormones in the bloodstream

Question 10

How do hormones sent by the nervous system work?

Answer 10

• The hormones travel through the entire body via the bloodstream
• They only effect certain cells which have the correct receptors

Question 11

What is negative feedback?

Answer 11

• Counteracts the change, bringing the conditions back to normal
• Consant loop of change (constant loop of fluctuating conditions)