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B2 5
Summary sheet

Teacher notes


Answers to summary questions
Answers
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…

Page 2

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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…

Page 3

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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)…

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1. (a) sweat - 6 squares high 2
urine - 15 squares high
each to < half a square for 1 mark each
(b) for hot day (assumed unless otherwise stated) 4
· same in breath
· same total
· more in sweat* / sweats more…

Page 5

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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…

Page 6

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description of evaporation (e.g .sweat
dries) for 1 mark




AQA Science © Nelson Thornes Ltd 2006 B2 1.1 6

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(b) (i) idea blood (passing through gut)
cooled (by ice) 1
(this) cooled blood cools brain 1
do not credit ice cools brain
(ii) impulses from brain /
thermoregulatory centre to skin 1
do not accept messages / signals
accept hypothalmus
accept electrical signals
vessels supplying…

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