Homeostasis: Temperature/glucose Flashcards
1
Q
How is temperature monitored?
A
thermoregulatory centre in brain
- receptors detect temperature of blood flowing through brain
- temperature receptors in skin send impulses to brain to give info about skin temperature
2
Q
outline effects on body when too hot
A
- sweating
- vasodilation
- hairs lay flat
- less active
3
Q
Why does sweating cool body?
A
evaporation of sweat - takes heat energy away from body
4
Q
What is vasodilation?
A
- blood vessels near surface of skin dilate - more blood flow through skin capillaries - more energy lost to environment (appearnce of being flushed)
5
Q
outline effects on body when too cold
A
- no sweating
- shivering
- vasoconstriction
- hairs stand up
6
Q
Why do we shiver when cold?
A
contractions of muscles produces energy from respiration to warm up body
7
Q
What is vasoconstriction?
A
- blood vessels near surface of skin constrict - less blood flow through skin capillaries - less energy lost to environment
8
Q
Why do hairs stand up?
A
trap air which is a good insulator
9
Q
What is hypothermia?
A
extreme cold
10
Q
Symptoms of hypothermia
A
- shivering
- confusion
- tiredness
- death
11
Q
Treatment of hypothermia
A
- warm clothing
- gove warm drinks
12
Q
Why is hypothermia worse in elderly and young children?
A
- elderly: dont move about as much so dont release as much energy
- children: large SA:volumeratio so transfer energy wuickly
13
Q
Why is it dangerous for children to be dehydrates?
A
- cannot cool down
- overheat
- enzymes denature
14
Q
What organ controls blood glucose levels/
A
pancreas
15
Q
what happens if blood glucose is too high?
A
- pancreas detects high level
- produces insulin
- allows glucose to be absorbed by body cells
- glucose converted into glycogen by insulin in liver for storage
