Thermoregulation and pyrexia L8 Flashcards
(57 cards)
at what temp does denaturing occur
above 45 degrees
range of temps where there is conscious intelligence
35-40 degrees
when in the day are you coolest
just before you wake up
when in the day are you hottest
mid afternoon
rise in temperature in the menstrual cycle
0.5 degrees at ovulation
what fibres transmit temperature
A delta and C fibres (same as pain)
coordinator of thermoregulation
anterior hypothalamus
do we have more hot or cold receptors
more cold receptors (we are a cold species)
normal body temp=
37.5 degrees
heat production=
metabolism
what type of response is most important to maintain temperature
voluntary actions
e.g of voluntary actions
wearing a coat
wearing less clothing in the sun
what disadvantage do the very old and very young have
often can’t put clothing on themselves
5 changes when too cold
shivering brown fat skin blood flow piloerection neuroendocrine
how much can shivering increase heat production
5%
what body movement is shivering predominately
truncal
disadvantage of shivering
metabolically expensive
can lose vital energy
who has brown fat
neonates and animals
what is brown fat (3)
- adipose tissue with lots of mitochondria
- higher blood supply than normal fat
- Beta 3 receptors
what does brown fat do
burns fat into energy
2 changes in skin blood flow
vasodilation
vasoconstriction
how much can skin blood flow alter heat loss
8%
what happens to skin blood flow in prolonged cold exposure
paradoxical increased flow
what Nervous system mediates skin blood flow
sympathetic
