Homeostasis

Question 1

Magnitude of error signal is proportional to the size of response and deviation

Answer 1

neg feedback sys

Question 2

magnitude of controlled variable sensed as stimulus to a receptor = self limiting
fed to integrating centre
compared to ref value
difference = error signal
effector mech = response

Answer 2

neg feedback sys

Question 3

restore regulated value after its initial displacement - cannot PREVENT from happening

Answer 3

neg feedback sys

Question 4

upper temp limit at which cells function

Answer 4

denaturation point of proteins

Question 5

humans

Answer 5

endotherm

homeotherm

Question 6

Can anticipate change and activate resp earlier

e.g. skin

Answer 6

Feed forward control

Question 7

neg feedback reg

1. least common type
2. causes a return to a set point
3. amplifies a response

Answer 7

causes a return to a set point

Question 8

Which compartment measured directly

Answer 8

ones containing plasma

TBW (total body water), ECF, plasma

Question 9

Which compartment measured indirectly

Answer 9

ISF, ICF

Question 10

150mg sucrose injected to 70 kg. [sucrose] was 0.01 mg/ml and 10mg were excreted.

Answer 10

(150 - 10) / 0.01 = 14000 ml

Question 11

dyes or radioactive labels that attach to plasma protein

Answer 11

I 125 albumin, Evans blue

Question 12

components that can be measured in ECF

Answer 12

inulin, sucrose, mannitol

Question 13

to measure TBW

Answer 13

heavy water (Deuterium oxide, D20)