Engineer & Medical

Locomotion and Movement question bank (Biology)

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Q1.

Which one of the following correctly describes the sequence of events leading to muscle contraction following acetylcholine release at the neuromuscular junction?

(A)

Decrease of $\text{Ca}^{++}$ in sarcoplasm, masking of active sites for myosin, 'Z' lines pulled inwards

(B)

Increase of $\text{Ca}^{++}$ in sarcoplasm, masking of active sites for myosin, 'Z' lines pulled inwards

(C)

Increase of $\text{Ca}^{++}$ in sarcoplasm, unmasking of active sites for myosin, 'Z' lines pulled inwards

(D)

Increase of $\text{Ca}^{++}$ in sarcoplasm, unmasking of active sites for myosin, 'Z' lines pulled outwards

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Q2.

Which one of the following statements is correct?

(A)

Red muscle fibres produce ATP aerobically under normal oxygen conditions.

(B)

Mitochondria are more in white than in red muscle fibres.

(C)

Lactic acid accumulates more in red than in white muscle fibres under similar (c) conditions.

(D)

All muscle fibres primarily produce ATP anaerobically.

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