Week 1

Question 1

Describe Homeostasis

Answer 1

Maintain a relatively constant internal environment in the body

Because… Cells are surrounded by extra cellular fluid that can change temperature chemical make up, ETC. Cells function optimally when these variables are in a narrow range.

Question 2

Three mechanisms involved in maintaining homeostasis

Answer 2

(1) receptor-monitors
(2) control centre-sends info
(3) effector-changes level back to normal

Question 3

what is auto-regulation?

Answer 3

No correspond, within one tissue or organ that coordinates homeostasis

Question 4

what extrinsic regulation?

Answer 4

involves multiple organs often including parts of the nervous system to coordinate homeostasis

Question 5

describe negative feedback

Answer 5

April it helps to maintain homeostasis reduces the deviation either way

Question 6

describe positive feedback

Answer 6

Increases the deviation (spirals out of control)
eg. Laughter, birth (oxytocin),blood clotting, feedback from a microphone