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 A
Explanation
Choice A rationale
Valvular prolapse, most commonly seen in the mitral valve, occurs when the valve leaflets become enlarged or floppy. During ventricular contraction, these leaflets do not close evenly and instead bulge or sink backward into the atrium. This can sometimes allow a small amount of blood to leak backward, known as regurgitation. The condition is often due to myxomatous degeneration of the connective tissue within the valve structures, leading to their abnormal shape.
Choice B rationale
A heart valve that becomes stiff and cannot open properly is the definition of valvular stenosis. In stenosis, the valve leaflets may become calcified or scarred, narrowing the opening and forcing the heart to work harder to pump blood through the restricted orifice. This is a different mechanical failure than prolapse, where the issue is the failure of the valve to stay closed and supported during the high-pressure phase of the cardiac cycle.
Choice C rationale
The chordae tendineae are the "heart strings" that normally prevent the valve leaflets from prolapsing. In the case of prolapse, these structures may actually be elongated or weakened, failing to provide the necessary tension to hold the leaflets in place. If they were to pull the valve tightly closed, it would represent normal function. Prolapse represents a failure of these supporting structures to maintain the proper position of the valve under pressure.
Choice D rationale
While a blood clot can interfere with heart function, it is not the mechanism for valvular prolapse. A clot on a valve, known as a vegetation in the context of infection or a thrombus, can cause an embolism or obstruction, but it does not cause the structural "floppiness" associated with prolapse. Prolapse is a structural and mechanical deformity of the valve tissue itself rather than a complication caused by an external obstructive mass.
Correct Answer is D
Explanation
Choice A rationale
Gastritis involves the inflammation, irritation, or erosion of the lining of the stomach. It can be acute or chronic and is often caused by H. pylori infection, excessive alcohol consumption, or the prolonged use of nonsteroidal anti-inflammatory drugs. While it involves inflammation of the digestive tract lining, it occurs in the stomach, not the colon, and does not involve the formation of small pouches or diverticula within the muscular layers of the organ.
Choice B rationale
Appendicitis is the inflammation of the appendix, a small finger-like projection located at the junction of the small and large intestines. While it is an inflammatory condition of the digestive tract, it is a localized infection of a specific anatomical structure. It does not involve the generalized formation of pouches throughout the colon lining. The symptoms are typically more acute and focused in the right lower quadrant of the abdomen rather than across the colon.
Choice C rationale
Ulcerative colitis is a type of inflammatory bowel disease that causes long-lasting inflammation and ulcers in the innermost lining of the large intestine and rectum. While it involves the colon, the pathology is characterized by continuous mucosal inflammation and shallow ulcerations rather than the herniation of the mucosa through the muscular wall to form pouches. The symptoms often include bloody diarrhea and tenesmus, which differ from the typical presentation of pouch inflammation.
Choice D rationale
Diverticulitis occurs when small, bulging pouches known as diverticula, which have formed in the lining of the digestive tract, become inflamed or infected. These pouches most commonly develop in the sigmoid colon where pressure is highest. When stool or bacteria become trapped in these pockets, it leads to the clinical syndrome of diverticulitis, characterized by left lower quadrant pain, fever, and changes in bowel habits. This matches the description of inflamed small pouches.
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