Biology 9700 · AS & A Level · Control and coordination in mammals
Control and coordination in mammals — practice question
In mammals, sensory receptor cells detect stimuli and then generate action potentials in sensory neurones. In human taste buds on the tongue, there are chemoreceptor cells. Different chemoreceptor cells respond to different chemical stimuli. Fig. 8.1 shows chemoreceptor cells within a taste bud.
(a)[1]
Name the structures found in region Y.
(b)[1]
Suggest a reason for the tight junctions between the chemoreceptor cells.
(c)[7]
Chemoreceptor cell A responds to sodium ions (Na+) in salt. Describe how contact of cell A with Na+ can lead to an action potential in sensory neurone B.
Worked solution & mark scheme
This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “microvilli, or brush border” …