Which of the Following Is the Correct Sequence That Describes

question 57

Multiple Choice

Which of the following is the correct sequence that describes the excitation and contraction of a skeletal muscle fibre?
1) Tropomyosin shifts and unblocks the cross-bridge binding sites.
2) Calcium is released and binds to the troponin complex.
3) Transverse tubules depolarise the sarcoplasmic reticulum.
4) The thin filaments are ratcheted across the thick filaments by the heads of the myosin molecules using energy from ATP.
5) An action potential in a motor neuron causes the axon to release acetylcholine, which depolarises the muscle cell membrane.

• A) 1 → 2 → 3 → 4 → 5
• B) 2 → 1 → 3 → 5 → 4
• C) 2 → 3 → 4 → 1 → 5
• D) 5 → 3 → 2 → 1 → 4

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Definitions:

High-risk Drinking

A pattern of alcohol consumption that increases the likelihood of harmful consequences for the drinker or others.

Misperceptions

False beliefs or understandings that occur when a situation is not correctly interpreted.

Perceived High-risk Drinking

The personal recognition or belief that one's consumption of alcohol is at a level that significantly increases the risk of harm to oneself or others.

Alcohol-related Injuries

Physical harm or damage that occurs as a direct or indirect result of alcohol consumption.