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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is False
Explanation
Choice A reason: This statement is incorrect. In anatomical position, the palms face forward (supinated), not backward (pronated). Pronated palms would indicate a rotated forearm, which is not the standard anatomical reference.
Choice B reason: This is correct. Anatomical position is defined with the body standing upright, feet together, arms at the sides, and palms facing forward. This orientation ensures consistency in anatomical terminology and reference.
Correct Answer is A
Explanation
Choice A reason: Smooth and cardiac muscle are capable of contracting without direct nervous stimulation. Cardiac muscle has intrinsic pacemaker cells that generate rhythmic contractions, and smooth muscle can respond to chemical signals, stretch, and local factors independently of neural input.
Choice B reason: Skeletal muscle requires nervous stimulation to contract. It is under voluntary control and cannot initiate contraction on its own, making this choice incorrect.
Choice C reason: While cardiac muscle can contract independently, this choice omits smooth muscle, which also has autonomous contractile ability. Therefore, it is incomplete.
Choice D reason: Skeletal muscle is entirely dependent on neural input for contraction. It cannot contract without stimulation from motor neurons.
Choice E reason: Smooth muscle can contract without nervous stimulation, but this choice excludes cardiac muscle, which also shares this property. Thus, it is not the best answer.
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