Which of the Following Is the Correct Sequence That Describes

question 58

Multiple Choice

Which of the following is the correct sequence that describes the excitation and contraction of a skeletal muscle fiber?
1) Tropomyosin shifts and unblocks the cross-bridge binding sites.
2) Calcium is released and binds to the troponin complex.
3) Transverse tubules depolarize 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 depolarizes 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 → 1 → 2 → 4
• E) 5 → 3 → 2 → 1 → 4

---

Definitions:

Women

Female human beings, often referred to in contexts relating to gender-specific health, rights, or societal roles.

Body Language

Non-verbal communication through gestures, facial expressions, behaviors, and postures.

Communication

The act of transferring information from one place, person, or group to another, through speaking, writing, or using some other medium.

Firm

Having a solid, unyielding surface or structure, often used to describe physical objects or business establishments with strong foundations.