Biology 9700 · AS & A Level · Control and coordination in mammals
Control and coordination in mammals — practice question
Fig. 7.1 shows an electron micrograph of part of striated muscle.
(a)[2]
State the name of structure P and the region shown by Q.
(b)[5]
Describe the function of calcium ions ($\text{Ca}^{2+}$ ions) in sarcomere shortening.
(c)[3]
A motor end plate in a neuromuscular junction forms part of a modified cholinergic synapse. Explain why mitochondria are found in the motor end plate of a neuromuscular junction.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “structure P is the Z line; region Q is the A band” …