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  • Created by: ellxe
  • Created on: 11-04-16 22:18
Define homeostasis
Maintaining a constant internal environment
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What three things do you need to balance the inputs and outputs of?
Level of CO2, Water Content, Body Temperature
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What is negative feedback?
A mechanism that works automatically to keep all things steady. Changes in environment trigger a response to counteract the changes. It only works in certain limits, so too big a change may not be counteracted.
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Where is body temperature controlled, and what is the optimum body temperature?
The brain, 37 degrees celcius
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What in the brain controls body temperature?
Thermoregulatory centre. It contains receptors that are sensitive to the blood temperature. The brain can respond to these using nerves and hormones.
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What happens when you are too hot?
Hairs lie flat, sweat is produced, blood vessels widen (vasodilation). High temperatures could mean dehydration and heat stroke!
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What happens when you are too cold?
Hairs stand on end, very little sweat, blood vessels constrict (vasoconstriction),shiver. Low temeratures could cause hypothermia
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What controls blood sugar levels?
Insulin. The level of glucose must be kept steady, and changes are monitored and controlled by the pancreas using insulin.
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What causes levels of glucose to rise/fall?
Food containing carbs makes it rise, respiration and vigorous exercise makes it fall.
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What happens if the blood glucose level is too high?
Insulin is added.
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What happens if the blood glucose level is too low?
Insulin is not added.
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Why doesnt insulin work as fast as nerve signals?
Insulin is a hormone, that has to travel in the blood. Nerve signals are electrical impulses so get there much faster.
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What does having diabetes mean?
You cant control your blood sugar levels.
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What is type 1 diabetes?
The pancreas produces little or no insulin. Glucose can rise to a fatal level! They can control it by a controlled diet and insulin injections.
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What is type 2 diabetes?
Where the person becomes resistant to insulin (body cells dont respond properly to the hormone). Causes blood sugar to rise to a dangerous level. Can be controlled by limiting the amount of foods eaten that are rich in simple carbs (e.g. sugar)
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Other cards in this set

Card 2

Front

What three things do you need to balance the inputs and outputs of?

Back

Level of CO2, Water Content, Body Temperature

Card 3

Front

What is negative feedback?

Back

Preview of the front of card 3

Card 4

Front

Where is body temperature controlled, and what is the optimum body temperature?

Back

Preview of the front of card 4

Card 5

Front

What in the brain controls body temperature?

Back

Preview of the front of card 5
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