Control and coordination in mammals — practice question

Fig. 8.1 shows a motor neurone diagram. Name cell X and part Y.

Name a cell type that synapses with structure Z.

Table 8.1 lists some of the events that take place during muscle contraction. They are not in the correct order. Complete Table 8.2 to show the correct order of the events that take place during muscle contraction. Two of the events have already been completed for you.

Lambert-Eaton myasthenic syndrome (LEMS) is a rare disorder affecting the neuromuscular junction. In a person with LEMS, antibodies attach to the voltage-gated calcium channels on the presynaptic knob. A symptom of LEMS is weaker muscle contraction. Suggest and explain why LEMS leads to weaker muscle contraction.