Homeostasis

Question 1

define: homeostasis

Answer 1

maintenance of a constant internal environment within narrow limits (despite changing internal/external envs)

Question 2

How is homeostasis maintained?

Answer 2

through signal transduction

Question 3

Generally in animals, the ____ system detects changes in homeostasis, while the ____ responds to changes in homeostasis

Answer 3

nervous system

endocrine system

Question 4

define: stimulus, receptor, message, effector, response

Answer 4

Stimulus: change in an internal or external environment
Receptor: specialised cells that detect changes and send info to control centre (eg. signal reception)
Message: evaluates change and sends hormonal or nerve message to effector (ie. signal transduction and subsequent steps)
Effector: tissue or organ that responds (ie. where, and what happens)
Response: the corrective action taken to achieve homeostasis (ie. cellular response which amplifies/opposes stimulus)

Question 5

define: positive feedback

Answer 5

when the original stimulus is amplified away from the normal value.

Question 6

define: negative feedback

Answer 6

when the response counteracts the initial stimulus