Summary
OCR A-Level Biology Thermoregulation Summary
Handwritten notes detailing all of the necessary Thermoregulation content for an A* in OCR A-Level Biology.
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&Ectotherms surroundings for
Rely on heat from their warmth
:
↳ fish amphibians Reptiles
, .
Endotherms :
Rely on heat from their own metabolic processes ->
stable core temperature
Behavioural Responses Sun
basking Burrowing vibrating
· .
:
·
Orientate or extend their bodies so the maximum surface is
facing towards/away from the sun
area ie
opening wings
↳
wingsie expand
.
open or
Physiological Responses :
Cold climate Darker radiation Hot lighter colours
·
:
colours absorb more
·
Climate
:
Peripheral temperature receptors :
In the skin , detect external
change
Internal temperature receptors In the the temperature of blood
hypothalamus monitor the
:
,
Behavioural Responses :
Basking Burrowing wallowing mud/water Hibernation/aestivation
·
.
in
· .
Physiological Responses :
Cooling Down :
·
Vasodilation :
Shin flushes and cools due to increased radiation
heat is lost
Sweating water evaporates
·
:
->
Reducing Insulation of hair/feathers Erector pili muscles relax and hair lies flat
·
:
Warming up :
vasoconstriction Shin and little radiation
pales
·
occurs
:
Raising hair feathers Erector pili contract ->
insulating air layer forms
·
muscles an
:
or
shivering metabolic heat of the exothermic reaction warms the
·
body
:
Heat loss Centre :
Temperature of the blood increases -> response is coordinated
Heat
gain Centre : Temperature of the blood decreases ->
response is coordinated
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