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26. Which of the following indicates the site and 28. In a cholinergic synapse, calcium ions (Ca )
mechanism for the reabsorption of glucose are involved in the transmission of nerve
into the blood capillaries from a human impulses by:
kidney nephron?
(A) generating an action potential of
+40mv in the postsynaptic knob
Site Mechanism (B) depolarizing the presynaptic knob by
entering the neurone
(A) Collecting duct Active transport (C) restoring the resting potential of the
neurone by leaving the cell
(B) Distal convo- Passive diffusion (D) triggering the release of
luted tubule neurotransmitter from the synaptic
vesicles
(C) Glomerulus Selective reabsorp-
tion
29. Which of the following combinations correctly
(D) Proximal Active transport identifies characteristics of both glucagon and
convoluted insulin?
tubule
Insulin Glucagon
(A) Raises blood sugar Lowers blood sugar
produced by beta cells produced by alpha cells
Item 27 refers to the diagram below. (B) Reduces blood sugar Raises blood sugar
Produced by alpha cells produced by beta cells
(C) Reduces blood sugar Raises blood sugar
Produced by beta cells produced by alpha cells
(D) Raises blood sugar Reduces blood sugar
Produced by alpha cells produced by beta cells

30. Which three of the following combinations
correctly describes the features which are
typical of endocrine communication?

I. Transmission is slow
II. Response is slow
III. Response is reversible
27. The diagram shows the changes in
IV. Response is widespread
membrane permeability when a stimulus is
applied to a neurone. In which region of the (A) I, II and III only
action potential A, B, C or D, do soduim ions
(B) I, III and IV only
begin to move in?
(C) II, III and IV only
(D) I, II and IV only

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02207010/SPEC 2017