Control of Body Temperature Flashcards
1
Q
What happens if there is a drop in body temperature?
A
- Detected by thermoreceptors in the hypothalamus -> detect a low blood and skin temperature
- passed onto sensory neuron
- nerve impluses sent to hypothalamus
- passed onto motor neuron
- nerve impulses sent to effectors
2
Q
What does shivering cause?
A
- skeletal muscles contract
- increased respiration generates heat
3
Q
What does adrenaline secreted form?
A
- form adrenal glands
- increases respiration, greater heat
4
Q
What does vasoconstriction cause?
A
- aertorioles close to skin contract
- reduced heat loss by radiaion
5
Q
What does the hairs standing up cause?
A
- erector pili muscles contract
- hairs trap warm air close to skin
- reduces heat loss
6
Q
What does no sweating cause?
A
- reduces heat loss
7
Q
Where are thermoreceptors?
A
- skin
- hypothalamus
8
Q
What happens if there is a rise in body temperature?
A
- thermoreceptors in the hypothalamus/skin detect rise in blood/skin temp
- send nerve impulse to hypothalamus by sensory neuron
- send nerve impulse to effectors via motor neuron
9
Q
What effect no shivering/ no adrenaline have?
A
- less heat generated by respiration
10
Q
What effect vasoconstriction have?
A
- arterioles close to kin dilate/moves more blood closer to surface of the skin
- increases heat loss by radiation
11
Q
What effect hairs lying flat have?
A
- errector pili muscles relax
- less heat is trapped close to skin
- increases heat loss
12
Q
What effect sweating have?
A
- sweat glands secrete sweat
- evaporates
- removes heat from skin
