Comprehensive Osteopathic Medical Licensing Examination (COMLEX USA) Practice

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How is Muscle strength grade 5 defined?

  1. Full ROM w/ gravity eliminated

  2. Full ROM against gravity

  3. Slightly hyperactive response

  4. Normal strength

The correct answer is: Normal strength

Muscle strength grade 5 is defined as "normal strength." This indicates that the muscle can withstand maximum resistance and move through its full range of motion against gravity. In the context of muscle testing, grade 5 signifies that the muscle has optimal strength, allowing it to perform activities effectively without any noticeable weakness or impairment. The other definitions refer to different strength grades. The description of full range of motion (ROM) with gravity eliminated corresponds to muscle grade 2, where the muscle is able to move without the effect of gravity. Full range of motion against gravity typically refers to grade 3 strength. A slightly hyperactive response may indicate an exaggerated reflex, but it does not specifically define muscle strength grades. Thus, understanding that grade 5 represents normal strength helps in accurately assessing a patient's muscle function.

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