Homeostasis

Question 1

define homeostasis

Answer 1

the condition of equilibrium within the body’s internal environment

Question 2

give an example when a set point can change

Answer 2

when ill- body temperature set point increases to produce a fever so that bug can be killed

Question 3

describe the process of homeostasis

Answer 3

1. receptors detect changes in conditions and send this afferent information to the brain
2. brain ‘centres’ receive information from the periphery and process and integrate this
3. brain centres send efferent information to effector organs through nerves or hormones to either negate or amplify the change

Question 4

how do you calculate gain of a regulated variable?

Answer 4

gain= amount of correction needed/ amount of abnormality after corection

Question 5

what are negative feedback loops

Answer 5

act to reduce an effect
they fine tune the body’s response to a stimulus

Question 6

what are positive feedback loops

Answer 6

act to increase a response
e.g. blood clotting in response to a cut

Question 7

what are feedforward loops?

Answer 7

physiological responses in anticipation to a change
e.g. increase in HR prior to a race

Question 8

what does a reflex response require?

Answer 8

requires knowledge from control centre
requires circuitry connecting receptor and effector

Question 9

what do local homeostatic controls allow?

Answer 9

individual parts of the body to self-regulate their responses to certain conditions