(a)[1]
On Fig. 5.1, draw a single arrow to show the direction of travel of a nerve impulse as it leaves the pyramidal cell body.
(b)
Fig. 5.2 shows the percentage of energy spent on different processes involved in maintaining resting potentials and in receiving and transmitting action potentials in a pyramidal cell.
(b(i))[3]
Explain why energy is needed to maintain a resting potential.
(b(ii))[3]
Outline the role of calcium ions in transmitting an impulse from the pyramidal cell to another neurone.
(b(iii))[2]
Pyramidal cells contain many mitochondria. Each dendrite has more mitochondria than the axon. Using Fig. 5.2, suggest reasons for this pattern of mitochondria distribution.