What three things do you need to balance the inputs and outputs of?
Level of CO2, Water Content, Body Temperature
2 of 15
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.
3 of 15
Where is body temperature controlled, and what is the optimum body temperature?
The brain, 37 degrees celcius
4 of 15
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.
5 of 15
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!
6 of 15
What happens when you are too cold?
Hairs stand on end, very little sweat, blood vessels constrict (vasoconstriction),shiver. Low temeratures could cause hypothermia
7 of 15
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.
8 of 15
What causes levels of glucose to rise/fall?
Food containing carbs makes it rise, respiration and vigorous exercise makes it fall.
9 of 15
What happens if the blood glucose level is too high?
Insulin is added.
10 of 15
What happens if the blood glucose level is too low?
Insulin is not added.
11 of 15
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.
12 of 15
What does having diabetes mean?
You cant control your blood sugar levels.
13 of 15
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.
14 of 15
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)
15 of 15
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
Card 4
Front
Where is body temperature controlled, and what is the optimum body temperature?
Comments
No comments have yet been made