2 The human brain controls many functions.

(a) The diagram shows a section through the human brain.

(i) Which labelled part of the brain contains the cardiovascular control centre?
(1)
A P
B Q
C R
D S

(ii) Which labelled part of the brain would control balance and
coordinate movement?
(1)
A \(P\)
B Q
C R
D \(\top\)

(iii) Which labelled parts would be involved in controlling the solute
concentration of blood plasma?
(1)
A Pand Q
B Q and R
C Pand R
D S and T

(b) Dopamine and serotonin are chemicals produced in the brain that are essential for good health.

(i) Which of the following statements about dopamine is correct?
(1)
A dopamine can pass from the bloodstream into neurones in the brain
B dopamine is a neurotransmitter
C high levels of dopamine are linked to depression
D low levels of dopamine cause the breakdown of myelin

(ii) Drugs called selective serotonin re-uptake inhibitors (SSRIs) affect the
reabsorption of serotonin at synapses in the brain.
This may help to reduce depression.
Explain why SSRIs can be used to treat depression.
(3)
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The human brain controls many functions. The diagram shows a section through the human brain. Which labelled part of the brain contains the cardiovascular control centre? (1)

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