Functions of the liver include which of the following? (Select All That Apply)
Medication detoxification.
Bile production.
Glucose storage.
Destruction of clotting factors.
Production of cholesterol.
Correct Answer : A,B,C,E
Choice A rationale
The liver is the primary organ responsible for the metabolism and detoxification of exogenous substances, including medications and alcohol. Through various enzymatic pathways, such as the cytochrome P450 system, the liver chemically modifies drugs to make them more water soluble for excretion by the kidneys. This prevents the accumulation of toxic levels of substances in the bloodstream. Impaired liver function can lead to prolonged drug half lives and increased risk of drug toxicity in patients.
Choice B rationale
Bile production is a vital exocrine function of the liver. Hepatocytes synthesize bile, which is composed of water, electrolytes, bile salts, and bilirubin. Bile is essential for the emulsification and absorption of dietary fats and fat soluble vitamins in the small intestine. It also serves as a vehicle for the excretion of waste products like bilirubin and excess cholesterol. Without adequate bile production, patients experience malabsorption and steatorrhea, which is characterized by fatty stools.
Choice C rationale
The liver plays a central role in carbohydrate metabolism and blood glucose regulation. It stores excess glucose in the form of glycogen through a process called glycogenesis. When blood glucose levels drop, the liver performs glycogenolysis, breaking down stored glycogen into glucose to be released into the circulation. Additionally, the liver can create new glucose from non carbohydrate sources via gluconeogenesis. These processes ensure that the body maintains a stable blood glucose level, typically 70 to 100 mg/dL.
Choice D rationale
The liver is responsible for the synthesis, not the destruction, of most clotting factors, including fibrinogen, prothrombin, and factors VII, IX, and X. These proteins are essential for the coagulation cascade and the prevention of excessive bleeding. In liver failure, the production of these factors decreases, leading to an increased prothrombin time and a higher risk of hemorrhage. The destruction of clotting factors is generally associated with consumptive coagulopathies like disseminated intravascular coagulation, not normal liver function.
Choice E rationale
The liver is the major site of cholesterol synthesis in the body. It produces cholesterol to be used in the formation of cell membranes, the synthesis of steroid hormones, and the production of bile acids. The liver also regulates cholesterol levels by exporting it to other tissues via lipoproteins and removing it from the blood. While dietary intake contributes to cholesterol levels, endogenous production by the liver accounts for a significant portion of the total cholesterol found in the human body.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
The occipital lobe serves as the primary hub for visual information. It allows an individual to recognize shapes, colors, and motion. While it helps one see written words, the actual comprehension of those words as language happens elsewhere. Receptive aphasia involves a failure to understand the meaning of spoken or written language, which is a higher-level cognitive linguistic function not performed by the primary visual processing neurons located in the most posterior brain region.
Choice B rationale
The frontal lobe is the seat of executive function, personality, and motor control. It includes Broca's area, which is responsible for the motor production of speech. While the frontal lobe is essential for planning what to say, it is not the primary site for decoding the meaning of incoming verbal communication. Receptive aphasia is a sensory-linguistic deficit rather than an executive or motor deficit, making the frontal lobe an unlikely primary site for this specific pathology.
Choice C rationale
The temporal lobe, specifically Wernicke's area in the superior temporal gyrus, is the primary region for language comprehension. When this area is damaged, the individual experiences receptive aphasia. They can hear words but cannot process their meaning, often perceiving speech as a foreign language. Consequently, their own speech remains fluent in rhythm but is filled with nonsensical words or paraphasias because they cannot monitor the meaningfulness of their own output during conversation.
Choice D rationale
The parietal lobe manages somatosensory perception and integrates sensory input to assist with spatial awareness. While it plays a role in some aspects of reading and writing through its connection to other regions, it is not the primary center for understanding spoken language. An injury here might result in difficulty with sensory localization or navigation but would not typically manifest as the profound loss of linguistic comprehension that defines receptive aphasia in a clinical setting.
Correct Answer is B
Explanation
Choice A rationale
Transient ischemic attacks are characterized by temporary cellular dysfunction rather than permanent tissue necrosis. Permanent loss of oxygen and blood flow defines an ischemic stroke, which results in irreversible damage to brain cells. In a TIA, the blockage is brief and the body’s fibrinolytic system typically dissolves the clot before cell death occurs. Therefore, suggesting that TIAs involve permanent loss is scientifically inaccurate regarding the pathophysiology of cerebral ischemia.
Choice B rationale
The pathophysiology of a TIA involves a temporary decrease in blood supply to a specific territory of the brain. This results in focal neurological deficits that typically resolve within 24 hours, often within minutes. Because blood flow is restored quickly, there is no permanent infarction of the brain tissue. This distinguishes it from a stroke where clinical symptoms persist due to neuronal death. Resolving without lasting effects is the hallmark of this transient vascular event.
Choice C rationale
Strokes involve an interruption of blood flow long enough to cause cerebral infarction, which is the death of brain tissue. Unlike TIAs, the damage from a stroke is often permanent because neurons have a very limited capacity for regeneration. Lasting effects such as hemiparesis, aphasia, or cognitive deficits are common consequences of the resulting necrotic tissue. Claiming that strokes do not cause lasting effects contradicts the fundamental medical definition of a completed stroke.
Choice D rationale
Stroke symptoms are generally persistent rather than temporary because they arise from actual brain tissue death or significant ischemia. While some symptoms may improve slightly during the recovery phase due to reduced edema, they do not typically resolve within minutes. Events that last only a few minutes are classified as transient ischemic attacks. Mistaking stroke symptoms for temporary events can delay critical medical interventions like thrombolytics, which are necessary to minimize permanent disability.
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