(a)[3]
Outline how the neurone achieves a transmission speed of $100\,\mathrm{m\,s^{-1}}$.
(b)[4]
When a nerve impulse arrives at the neuromuscular junction, acetylcholine is released and diffuses to the sarcolemma. Describe how the release of acetylcholine can result in the binding of calcium ions to troponin in the sarcomere.
(c)[3]
A low blood glucose concentration may influence muscle contraction. Suggest how a low blood glucose concentration would affect the functioning of the sarcomere.