Biology 9700 · AS & A Level · Control and coordination in mammals
Control and coordination in mammals — practice question
A large number of mitochondria are found in the presynaptic knobs of neuromuscular junctions and in the sarcomeres of the muscle fibres of striated muscle.
(a)[4]
Explain why numerous mitochondria are needed in the presynaptic knobs and in the sarcomeres.
(b)[3]
Explain whether you agree or disagree with these statements.
(c)[2]
Multiple sclerosis is a disorder in which the myelin sheath is destroyed in some neurones. Suggest the effect of multiple sclerosis on the transmission of action potentials in the affected neurones.
Worked solution & mark scheme
This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “mitochondria generate ATP” …