Mr Allsopp- Homeostasis

Question 1

what is the definition of homeostasis

Answer 1

maintaining a dynamic equilibrium with small fluctuations over a narrow range of conditions
- not maintaining constantly but regulating- cannot be completely stable

Question 2

factors controlled by homeostasis

Answer 2

temp, hormones, blood glucose conc., PH

Question 3

what is negative feedback

Answer 3

if increase/ decrease is detected responses lower/ increase levels to bring it back to ideal conditions

Question 4

explain how negative feedback works for blood glucose levels

Answer 4

too much - insulin released to decrease as it causes glucose to be stored glycogen
too little- glucagon released to liver to break down glycogen back to glucose

Question 5

what is positive feedback and examples

Answer 5

change detected, responses reinforce the change
-labour contractions
-blood clotting- cut- collagen exposed- platelets bind to it forming plug