1. importance of homeostasis Flashcards
1
Q
what region of the brain controls temperature?
A
the hypothalamus
2
Q
outline the process of the hypothalumus controlling temperature
A
- contains receptors sensitive to the temperature of blood
- receives nervous impulses from thermoreceptors in the skin
- sends nervous impulses along motor neurones to various effectors
3
Q
outline the process of thermoregulation when you are too hot
A
- more sweat is released
- blood vessels dilate
- increases blood flow to the skin
- increases heat loss
- called vasolidation
- nervous impulses are sent to the hair erector muscles in the skin
- causes skin hair to relax
- called pilorelaxation
4
Q
outline the thermoregulatory response when it is too cold
A
- skeletal muscles contract rapidly
- these contractions need energy from respiration
- releases heat
- blood vessels constrict
- allows less blood to flow through capillaries to skin
- conserve core body temperature
- called vasoconstriction
- nerve impulses are sent to the hair erector muscles in the skin which contract
- causes a layer of insulation
- called piloerection
5
Q
what system is blood glucosed controlled by
A
negative feedback
6
Q
what percentage of blood plasma is water
A
90-92%
7
Q
what is negative feedback
A
returning levels in the body back to optimum conditions
8
Q
what is positive feedback
A
when your levels are exceeded beyond the optimum
9
Q
give an example of positive feedback
A
increased contractions during childbirth
10
Q
A
