A nurse is caring for a client diagnosed with hepatitis. What is the most likely mode of transmission for this client?

Choice A rationale

Huntington's disease is a genetic neurodegenerative disorder characterized by chorea, which are involuntary, jerky, and rapid movements. While it involves motor instability, it does not typically present with the classic pill-rolling tremor or the specific type of bradykinesia seen in Parkinson's. Huntington's involves a different part of the basal ganglia and results from a repeat expansion in the HTT gene. The clinical presentation is more focused on cognitive decline, psychiatric issues, and hyperkinetic movements rather than resting tremors.

Choice B rationale

Alzheimer's disease is primarily a neurocognitive disorder characterized by progressive memory loss, disorientation, and linguistic decline. While advanced stages may involve some motor changes or gait disturbances, the hallmark early signs are not postural instability or pill-rolling tremors. Alzheimer's involves the accumulation of amyloid plaques and tau tangles in the cortex. It is distinguished from movement disorders by its early and profound impact on short-term memory and executive functioning rather than resting motor tremors.

Choice C rationale

Parkinson's disease is a progressive movement disorder caused by the degeneration of dopamine-producing neurons in the substantia nigra. The classic triad of symptoms includes bradykinesia, muscle rigidity, and a resting tremor often described as pill-rolling. Postural instability is another hallmark, leading to a high risk of falls and a characteristic shuffling gait. These motor symptoms result from the loss of inhibitory control in the basal ganglia, making Parkinson's the condition most closely associated with these specific findings.

Choice D rationale

Multiple sclerosis is an inflammatory demyelinating disease that can cause a wide range of symptoms including vision loss, weakness, and ataxia. While it can cause tremors, they are typically intention tremors that occur during movement rather than the resting pill-rolling tremors seen in Parkinson's. MS symptoms are highly variable and depend on the location of the lesions in the central nervous system. It lacks the specific dopaminergic depletion pattern that produces the characteristic resting tremor and postural rigidity.

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.