What statement accurately describes type 2 diabetes mellitus?
The pancreas produces insulin, but the body doesn't use it properly.
Insulin levels are elevated due to overstimulation of the pancreas.
A lack of insulin results in the inability of glucose to enter the cells.
Excess stress stimulates the pancreas to reduce insulin production.
The Correct Answer is A
Choice A rationale
Type 2 diabetes mellitus is primarily characterized by insulin resistance, a condition where the body cells, particularly in the liver, muscle, and adipose tissue, fail to respond adequately to insulin. Although the pancreas may initially produce sufficient or even elevated levels of insulin to compensate for this resistance, the glucose remains in the bloodstream rather than entering cells. This metabolic dysfunction leads to chronic hyperglycemia and subsequent vascular complications over time.
Choice B rationale
While hyperinsulinemia may occur during the early compensatory phase of type 2 diabetes, the disease is not defined by overstimulation of the pancreas. Instead, chronic overstimulation of beta cells often leads to their eventual exhaustion and dysfunction. The primary pathology is the inability of peripheral tissues to utilize the available insulin effectively. Elevated insulin levels are a secondary response to high blood glucose rather than the fundamental cause of the diabetic state itself.
Choice C rationale
An absolute lack of insulin production is the hallmark of type 1 diabetes mellitus, which results from autoimmune destruction of the pancreatic beta cells. In type 2 diabetes, insulin is typically present, but its biological effect is diminished due to receptor or post-receptor signaling defects. While the end result in both types is the inability of glucose to enter cells, the underlying mechanism in type 2 is functional resistance rather than a manufacturing failure.
Choice D rationale
Stress induces the release of cortisol and catecholamines, which are counter-regulatory hormones that increase blood glucose through gluconeogenesis and glycogenolysis. This physiological response actually prompts the pancreas to increase insulin production to manage the glucose surge. Stress does not stimulate the pancreas to reduce insulin production; rather, the persistent metabolic demand and hormonal imbalance can exacerbate existing insulin resistance and complicate the management of blood glucose levels in diabetic patients.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
Increasing glucose absorption is a metabolic function primarily related to energy production and insulin regulation, not the immediate stabilization of gas exchange. While the body requires glucose for cellular respiration, the acute compensatory mechanisms for hypoxia or hypercapnia are focused on the cardiovascular and respiratory systems. Enhancing nutrient uptake does not address the physiological need for better oxygen delivery or carbon dioxide removal during a state of impaired gas exchange or respiratory distress.
Choice B rationale
Decreasing the respiratory rate would be maladaptive during impaired gas exchange. When the body senses low oxygen or high carbon dioxide levels, the brain's respiratory centers normally trigger tachypnea, or an increased rate, to enhance ventilation. Reducing the rate would lead to further CO2 retention and worsening hypoxia. Homeostasis requires the body to move more air across the alveolar-capillary membrane, so a decrease in breathing frequency would actually exacerbate the underlying gas exchange problem.
Choice C rationale
When gas exchange is impaired, the body experiences hypoxia, which triggers the sympathetic nervous system. This results in an increased heart rate and systemic vasoconstriction to boost cardiac output and blood pressure. By increasing blood pressure, the body attempts to maintain perfusion to vital organs and improve the transport of available oxygen to tissues. This cardiovascular compensation is a standard homeostatic response to ensure that limited oxygen supplies are distributed as efficiently as possible.
Choice D rationale
Decreasing the surface area of the alveoli would significantly worsen impaired gas exchange. Effective respiration relies on a large surface area for the diffusion of gases between the lungs and the blood. Pathological conditions like emphysema decrease this area, leading to chronic illness. To maintain homeostasis, the body requires maximum functional surface area. The body cannot voluntarily decrease this area as a compensatory mechanism; doing so would only further reduce the efficiency of oxygen uptake.
Correct Answer is ["A","C"]
Explanation
Choice A rationale
Hyperthyroidism is characterized by a hypermetabolic state due to excess circulating thyroid hormones like T3 and T4. This excess increases the basal metabolic rate, leading to symptoms such as nervousness from central nervous system overstimulation and heat intolerance from increased thermogenesis. The body also demands more fuel to sustain this high metabolic activity, which manifests as an increased appetite despite the potential for significant and unintentional weight loss.
Choice B rationale
This statement is incorrect because it mixes symptoms of two different conditions. While bradycardia, or a heart rate below 60 beats per minute, is a classic sign of hypothyroidism due to decreased sympathetic activity, unintentional weight loss is a hallmark of hyperthyroidism. Hypothyroidism typically presents with weight gain or difficulty losing weight because the metabolic rate is significantly slowed, leading to decreased energy expenditure and increased fluid retention or myxedema.
Choice C rationale
Hypothyroidism results from a deficiency in thyroid hormones, which leads to a generalized slowing of body processes. Periorbital edema occurs due to the accumulation of glycosaminoglycans in the interstitial spaces, a condition known as myxedema. Additionally, the reduction in metabolic demand and sympathetic nervous system sensitivity leads to bradycardia, where the heart rate falls below the normal range of 60 to 100 beats per minute, confirming these as hypothyroid manifestations.
Choice D rationale
This statement is partially incorrect. While heat intolerance is a common finding in hyperthyroidism due to the increased metabolic rate and heat production, periorbital edema is more typically associated with the myxedematous changes found in hypothyroidism. Although Graves' disease can cause exophthalmos, which may involve swelling, the general term periorbital edema is a classic indicator of the sluggish lymphatic and metabolic state seen in patients with low thyroid function.
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