What is the primary function of wave summation?
Prevent muscle fatigue
Increase muscle tension
Produce smooth, continuous muscle contraction
Lessen a muscle contraction
The Correct Answer is C
Choice A reason: Preventing muscle fatigue is not the primary function of wave summation. Fatigue is influenced by metabolic factors and sustained activity, not by the summation of muscle twitches.
Choice B reason: While wave summation does increase muscle tension, this is a secondary effect. The main purpose is to produce a more sustained and coordinated contraction.
Choice C reason: Wave summation occurs when successive stimuli are delivered before the muscle has completely relaxed, leading to a stronger and smoother contraction. This mechanism allows for continuous muscle activity, making it the correct answer.
Choice D reason: Wave summation enhances, not lessens, muscle contraction. It builds upon previous contractions to produce a more forceful and sustained response. Therefore, this choice is incorrect.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is E
Explanation
Choice A reason: Central lamellae is not a recognized anatomical term. The central canal, however, is part of an osteon and contains blood vessels and nerves. It does not refer to lamellae between osteons.
Choice B reason: Concentric lamellae are rings of bone matrix that surround the central canal within an osteon. They are integral to the osteon structure and not found between osteons.
Choice C reason: Circumferential lamellae are located around the outer and inner surfaces of compact bone, encircling the entire bone structure. They are not found between osteons.
Choice D reason: Perforating canals, or Volkmann’s canals, run perpendicular to the central canals and connect them to the periosteum and medullary cavity. They are not lamellae and do not lie between osteons.
Choice E reason: Interstitial lamellae are remnants of old osteons that have been partially resorbed during bone remodeling. They fill the spaces between current osteons and are not part of any single osteon, making them the correct answer.
Correct Answer is C
Explanation
Choice A reason: A meatus is a canal-like passageway through bone, such as the external auditory meatus in the skull. It does not describe a rounded projection.
Choice B reason: A foramen is a hole or opening in a bone that allows the passage of nerves and blood vessels. It is not a projection.
Choice C reason: A condyle is a rounded articular projection that typically forms part of a joint. It allows for smooth articulation with another bone, making it the correct answer.
Choice D reason: A fossa is a shallow depression in a bone, often serving as an articular surface or for muscle attachment. It is not a projection.
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