Homeostasis

Question 1

Define homeostasis

Answer 1

All body systems working together to maintain a stable internal environment within narrow limits

Question 2

List 3 factors determining when an organism is at homeostasis

Answer 2

• Contains optimal amount of chemicals
• Has optimal temp
• has optimal pressure for survival of living cells

Question 3

Differentiate b/t intrinsic/auto regulation + extrinsic

Answer 3

• Intrinsic = automatic response within a cell, tissue or organ to a change
• Extrinsic = responses controlled by endocrine + NS

Question 4

Describe the 3 components for homeostasis

Answer 4

Receptor = sensor -> monitors physical environment + signals change
Control centre = processes signals + sends instructions for response to occur / determines level of change needed
Effector = carries out instructions sent by control centre

Question 5

Describe how negative feedback loops work

Answer 5

• response of effector reduces/stops stimulus
• body brought back into homeostasis
• normal range achieved

Question 6

Describe how positive feedback loops work

Answer 6

• response of effector increases change of stimulus
• body moved away from homeostasis
• normal range lost
  -> speeds up processes eg. childbirth