human nervous sytem Flashcards
1
Q
where is the body temperature controlled in the body?
A
body temperature is controlled by the thermoregulatory centre in the hypothalamus of the brain.
2
Q
how is temperature monitored by the body?
A
- thermoregulatory centre has receptors sensitive to blood temperature
- skin has receptors sensitive to skin temperature - sends impulses to thermoregulatory centre.
3
Q
what physiological changes occur when the body temperature is too high?
A
Vasodilation - blood vessels near the surface of the skin dilate - more heat is radiated away
Sweating - evaporation of water takes away heat energy from the surface of the skin
4
Q
what physiological changes occur when the body temperature is too low?
A
Vasoconstriction - blood vessels near the surface of the skin constrict - less heat radiated away
Shivering - respiration allows muscles to contract. It is an exothermic process, so heat energy is released.
- Sweating stops
