What is the function of cerebrospinal fluid (CSF)?
It produces cerebral neurotransmitters.
It acts as a barrier to bacteria.
It acts as an insulator to maintain a constant spinal fluid temperature.
It cushions the brain and spinal cord.
The Correct Answer is D
Choice A rationale
Cerebrospinal fluid (CSF) does not produce cerebral neurotransmitters. Neurotransmitters are produced by neurons in the brain and nervous system.
Choice B rationale
CSF provides a protective barrier to some extent, but its primary function is not to act as a barrier to bacteria. The blood-brain barrier primarily serves this function.
Choice C rationale
CSF helps maintain a stable environment in the central nervous system but is not primarily an insulator for maintaining constant temperature. Its thermal properties are secondary.
Choice D rationale
The primary function of CSF is to cushion and protect the brain and spinal cord from mechanical injury. It also helps maintain the brain's buoyancy and provides a stable environment for the central nervous system.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale
Necrosis is tissue death resulting from prolonged pressure, often a consequence rather than the direct cause of pressure ulcers. The primary cause is sustained pressure impairing blood flow.
Choice B rationale
Low capillary pressure does not directly cause pressure ulcers. They result from sustained external pressure exceeding capillary perfusion pressure, leading to ischemia and tissue damage.
Choice C rationale
Increased mobility actually prevents pressure ulcers by reducing sustained pressure on any one area, enhancing blood flow and tissue health. Immobility is a significant risk factor, not increased mobility.
Choice D rationale
Extrinsic factors like sustained pressure, friction, shear, and moisture contribute directly to pressure ulcer development by compromising skin integrity and blood flow, leading to tissue ischemia and damage.
Correct Answer is B
Explanation
Choice A rationale
Lordosis is an exaggerated inward curvature of the lumbar spine. It is commonly seen in pregnant women, individuals with obesity, or those with weak abdominal muscles. Lordosis is not characterized by an increased thoracic curvature.
Choice B rationale
Kyphosis is an exaggerated outward curvature of the thoracic spine, often resulting in a hunched or rounded back. It is commonly seen in older adults due to osteoporosis, degenerative disc disease, or poor posture. Kyphosis is the correct diagnosis for increased thoracic curvature.
Choice C rationale
Scoliosis is a lateral curvature of the spine, often resembling an "S" or "C" shape when viewed from behind. It can occur in any part of the spine but does not specifically describe an increased thoracic curvature.
Choice D rationale
Epiphyses refer to the growth plates at the ends of long bones in children and adolescents. They are not related to spinal curvature or any spinal disorder. .
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