The following sequence of events occurs at the neuromuscular junction. Nerve impulse -> release of V -> end plate potential -> W produced in muscle fibre -> X release from sarcoplasmic reticulum -> Formation of Y -> muscle contraction. Which one of the following shows the correct sequence from V -> Y?
Correct answer: A. Option A
- A. Option A
- B. Option B
- C. Option C
- D. Option D
- E. Option E
Explanation
Neurotransmitters called acetylcholine (V) are released, and an action potential (W) is generated. After an action potential is generated in the muscle fibre, calcium ions (X) are released from the sarcoplasmic reticulum. Ca ions act on troponin and displace it so that myosin can attach to the sites on the actin molecule, forming an actomyosin (Y) complex for muscle contraction.
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Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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