Homeostasis

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B2 5
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1 a) Head and extremities (like fingers and toes).
b) The elderly and babies. The elderly often do not eat enough food and are
less likely to put heating on to keep warm (cost implications). Babies have a
large surface area to volume ratio.
c) Wear a number of layers of clothes, eat regular hot meals, keep heating on.
d) Each layer of clothing traps a layer of insulating air.
2 a) To ensure enzymes are kept at an optimum temperature.
b) Lower temperatures reduce the activity of enzymes (i.e. rate of reaction).
c) Enzymes are denatured by high temperatures [Higher tier] and will stop
working.
d) Brain (thermoregulatory centre).
Teaching notes
The questions are designed to crystallise knowledge and are not designed to be
exam style. This format is particularly useful for students who have difficulty
answering questions without some kind of writing frame.
AQA Science © Nelson Thornes Ltd 2006 B2 5 1

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B2 5
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Homeostasis
1 1 Thermoregulatory
2 Dilate
3 Radiation
4 Sweating
5 Constrict
6 Shivering (6 marks)
2 a) Breathing/expired air (1 mark)
b) The figure for sweat would be higher. (1 mark)
The figure for urine would be lower. (1 mark)
Accept figures provided they show the appropriate increase/decrease.…read more

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B2 5
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this part of the question provided the points made are consistent
with their error on the graph.
4 a) Because it would be broken down. (1 mark answer)
As insulin is a protein, it would be broken down by enzymes in the
stomach. (2 marks answer)
For both marks the key words in bold (or their equivalent) must be
correctly linked.
b) It would get higher/increase. (1 mark)
c) Glucose in the urine/increased thirst/increased hunger/urinating
excessively/tiredness/weight loss/blurred vision.…read more

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B2 5
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1.…read more

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(c) ideas that 4
· when blood water normal/100%/steady kidney re-absorbs water at
low/steady rate
· when blood water percentage falls, the rate at which kidney re-absorbs water
rises
· when blood water percentage rises again, is high/normal the rate at which
kidney re-absorbs water falls
· 97 / 97.…read more

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B2 5
Continued ...
description of evaporation (e.g .sweat
dries) for 1 mark
AQA Science © Nelson Thornes Ltd 2006 B2 1.…read more

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B2 5
Continued ...…read more

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