Flashcards in homeostasis Deck (6)
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1
Q
what is homeostasis
A
homeostasis maintains conditions inside the body at a constant level.
2
Q
what is negative feedback
A
negative feedback mechanisms respond to a change in a condition to help bring the condition back to the normal level.
3
Q
what does osmoregulation do
A
osmoregulation controls how much water is lost in urine, and so controls the amount of water in the body
4
Q
what is thermoregulation and why is it important
A
keeps core body temperature steady at 37 degrees. important as enzymes in the main organs are most active at this temperature.
5
Q
explain what happens when body temperature rises due to hot environment or exercise.
A
- hypothalamus in brain detects rise and causes body responses
- vasodilation so more blood flows near skin surface, sweat glands release more sweat onto skin surface to evaporate, sebaceous gland produce oil that helps sweat spread out over skin
- more heat transferred to environment, body temperature falls
6
Q
explain what happens when body temperature falls due to cold environment.
A
- hypothalamus detects fall and causes body responses
- vasoconstriciton so less blood flows near skin surface, sweat glands stop producing sweat, body hairs raised by erector muscles in skin.
- less heat transferred to environment, body temperature rises.