A client with damage to the frontal lobe is most likely to exhibit which change?
Loss of coordination.
Decreased auditory processing.
Loss of vision.
Impaired judgment.
The Correct Answer is D
Choice A rationale
Coordination and fine motor control are primarily functions of the cerebellum, not the frontal lobe. The cerebellum receives sensory input and integrates it to ensure smooth, balanced muscular activity. Damage to the cerebellum results in ataxia or dysmetria rather than the cognitive shifts associated with the anterior brain. Frontal lobe damage may affect the motor cortex, but the specific loss of coordination as a standalone symptom points away from this region.
Choice B rationale
Auditory processing and the interpretation of sound are centered in the temporal lobe, specifically within the primary auditory cortex. While the frontal lobe manages the executive functions of focusing on specific sounds, the actual processing of auditory stimuli remains a temporal function. Damage to the frontal lobe typically leaves the ability to hear and interpret basic sounds intact, focusing instead on behavior, personality, and the higher-level decision-making processes of the human brain.
Choice C rationale
Vision is processed in the occipital lobe located at the posterior of the brain. The primary visual cortex receives signals from the retinas via the optic nerves and tracts. Damage to the frontal lobe does not typically result in a loss of vision because the visual pathways and processing centers are anatomically distinct and distant. Frontal lobe injuries are more likely to cause issues with voluntary eye movements or the cognitive focus required for visual tasks.
Choice D rationale
The frontal lobe is responsible for executive functions, including reasoning, social behavior, impulse control, and judgment. This region acts as the brain's control center, weighing consequences and making complex decisions. When this area is damaged by trauma or disease, individuals often demonstrate poor decision-making, social inappropriateness, and a significant lack of insight into their actions. This impairment in judgment is a hallmark clinical sign of dysfunction within the prefrontal cortex specifically.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
A spinal cord injury involves damage to the axons and neurons within the spinal canal. Nervous tissue is responsible for transmitting electrical impulses from the brain to the peripheral muscles. When this tissue is damaged, the "messages" for voluntary movement cannot reach their destination. Even if the muscles themselves are healthy, they remain immobile because the neural circuitry required to initiate contraction has been disrupted. Thus, the primary site of the pathology is the nervous tissue.
Choice B rationale
Muscle tissue is the effector organ that carries out the movement, but it is not the tissue primarily affected by a spinal cord injury. In the initial stages of such an injury, the muscles are structurally intact. They only begin to atrophy later due to a lack of neural stimulation, known as disuse atrophy. The paralysis is a secondary result of the loss of innervation, meaning the muscle tissue is waiting for a signal that the damaged nervous tissue can no longer provide.
Choice C rationale
Connective tissue, which includes bone, cartilage, and tendons, provides the structural framework for the body. While a fractured vertebra (bone) often causes a spinal cord injury, the connective tissue itself is not responsible for the loss of voluntary movement. The connective tissue remains capable of supporting the body's weight or connecting muscle to bone, but without the electrical input from the nervous system, the mechanical components of the musculoskeletal system cannot be activated for purposeful motion.
Choice D rationale
Epithelial tissue forms the linings of organs, the skin, and the various glands of the body. Its primary functions include protection, absorption, and secretion. While epithelial cells are present in the membranes surrounding the spinal cord (such as the arachnoid mater), they do not play a role in the conduction of motor signals. Damage to epithelial tissue would not result in the loss of voluntary muscle control or the paralysis seen following a traumatic neurological event. .
Correct Answer is B
Explanation
Choice B rationale
Anxiety-induced hyperventilation leads to an excessive elimination of carbon dioxide via the lungs, resulting in respiratory alkalosis. The blood gas values show a pH of 7.48, which is above the normal range of 7.35 to 7.45, and a PaCO2 of 30 mmHg, which is below the normal range of 35 to 45 mmHg. The elevated HCO3 of 29 mEq/L, compared to the normal 22 to 26 mEq/L, indicates a partially compensated or mixed alkalotic state.
Choice A rationale
Renal failure typically results in metabolic acidosis because the kidneys are unable to excrete hydrogen ions or reabsorb sufficient bicarbonate. This would present with a pH below 7.35 and a low HCO3 level. In this specific case, the pH is alkaline at 7.48 and the bicarbonate is elevated at 29 mEq/L, which contradicts the expected findings of renal insufficiency. Lab values for chronic kidney disease often reflect high creatinine and urea rather than primary respiratory alkalosis.
Choice C rationale
Severe diarrhea causes a significant loss of bicarbonate from the lower gastrointestinal tract, leading to metabolic acidosis. The expected arterial blood gas results for this condition would include a pH lower than 7.35 and a bicarbonate level lower than 22 mEq/L. Since the client has an alkaline pH and high bicarbonate, diarrhea is an unlikely cause. Metabolic acidosis usually triggers compensatory hyperpnea, but the primary pathology here is alkalosis rather than an acidic state.
Choice D rationale
Opioid overdose causes central nervous system depression, leading to hypoventilation and respiratory acidosis. This condition results in the retention of carbon dioxide, causing the PaCO2 to rise above 45 mmHg and the pH to drop below 7.35. The clients current blood gas profile shows a low PaCO2 and a high pH, which is the exact opposite of what occurs during respiratory depression. Opioids decrease the respiratory rate and depth, leading to hypercapnia rather than hypocapnia.
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