The first event to occur in muscle relaxation is that:
tropomyosin returns to its original position.
myosin cross-bridges are prevented from binding to actin.
the sarcoplasmic reticulum begins actively pumping calcium back into its sacs.
acetylcholine is released.
The Correct Answer is C
A. tropomyosin returns to its original position: This happens later in the process; it is a result of calcium removal, not the first event.
B. myosin cross-bridges are prevented from binding to actin: This is the final stage of relaxation where the physical contraction stops.
C. the sarcoplasmic reticulum begins actively pumping calcium back into its sacs: Relaxation officially begins when nerve stimulation stops and the sarcoplasmic reticulum uses active transport to remove Ca 2+ from the sarcoplasm.
D. acetylcholine is released: This is the first step of muscle contraction, not relaxation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. taste: Taste impulses are carried by the facial, glossopharyngeal, and vagus nerves.
B. equilibrium: Balance/equilibrium is handled by the vestibulocochlear nerve (CN VIII).
C. smell: The olfactory nerve (CN I) and its tracts are dedicated exclusively to the sense of olfaction (smell).
D. pain: Pain is a general sense carried by various nerves, most notably the trigeminal nerve for the face.
Correct Answer is B
Explanation
A. Viruses: Viruses are the simplest pathogens, consisting only of genetic material and a protein coat.
B. Tapeworms: These are the most complex because they are multicellular animals (helminths) with specialized organ systems for reproduction and attachment.
C. Bacteria: These are single-celled prokaryotic organisms, which are more complex than viruses but less complex than multicellular animals.
D. Protozoa: These are single-celled eukaryotic organisms; while complex for a single cell, they lack the tissue and organ complexity of a worm.
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