Which is the best description for the function of the cranial bones?
Protection of the brain
Attaches muscle to the facial bones
Allowing the introduction of food into the digestive system
Providing passageways for respiratory gases to move into and out of the body
House the special sense organs
The Correct Answer is A
Choice A reason: Protection of the brain is the primary function of cranial bones. They form the skull, which encases and shields the brain from mechanical injury.
Choice B reason: Muscles attach to facial bones, not cranial bones. While cranial bones may serve as attachment sites for some muscles, this is not their main function.
Choice C reason: The introduction of food into the digestive system involves the mouth and associated facial structures, not cranial bones.
Choice D reason: Passageways for respiratory gases are formed by facial bones and nasal structures, not the cranial bones.
Choice E reason: Special sense organs such as the eyes, ears, and nose are housed in facial bones and cavities, not primarily in cranial bones. Cranial bones protect the brain, not sensory organs.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: The myofibrillar network refers to the arrangement of actin and myosin filaments responsible for muscle contraction. While essential for force generation, it does not store calcium. Its role is mechanical, not regulatory in terms of calcium ion concentration.
Choice B reason: The sarcoplasmic reticulum is a specialized form of smooth endoplasmic reticulum found in muscle cells. It functions as the primary site for calcium storage and release during muscle contraction. Upon stimulation, it releases calcium ions into the cytosol, initiating the interaction between actin and myosin filaments. This makes it the central regulator of calcium dynamics in skeletal muscle.
Choice C reason: T tubules (transverse tubules) are invaginations of the sarcolemma that help propagate action potentials into the interior of the muscle fiber. They facilitate communication between the sarcolemma and the sarcoplasmic reticulum but do not store calcium themselves.
Choice D reason: Mitochondria are responsible for ATP production through oxidative phosphorylation. Although they can buffer calcium to some extent, they are not the primary calcium storage organelle in skeletal muscle cells.
Choice E reason: The intermediate filament network provides structural support and maintains the integrity of the cell’s shape. It does not have a role in calcium storage or release during muscle contraction.
Correct Answer is D
Explanation
Choice A reason: "Osseosus" is not a recognized scientific law or principle. It appears to be a misspelling or fictional term.
Choice B reason: Dalton's Law pertains to the behavior of gases, specifically the partial pressures in a mixture. It has no relevance to bone remodeling.
Choice C reason: "Calcine's" is not a known law or principle in physiology or anatomy. It may be a misrepresentation or confusion with calcitonin, a hormone involved in calcium regulation.
Choice D reason: This is correct. Wolff's Law states that bone grows and remodels in response to the mechanical stresses placed upon it. This principle explains how bones adapt to increased load or disuse by altering their density and structure.
Choice E reason: Boyle's Law relates to the pressure and volume of gases in a closed system. It is unrelated to bone physiology.
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