Nursing practice questions with comprehensive rationales
NurseDive Free Nursing Practice Question
Neuropathies are a potential complication of diabetes. Why do these occur?
A. Thickening and ischemia of the vessels that supply the nerve fibers.
Neuropathies occur due to the thickening, sclerosis, obstruction, and ischemia of the small blood vessels that supply the nerves (vasa nervorum). Chronic hyperglycemia leads to damage of these blood vessels, reducing blood flow and oxygen supply to the nerves. This ischemia results in nerve degeneration, delayed nerve conduction, and impaired sensory function, which are characteristic of diabetic neuropathy.
B. Infection in the nerves.
Infection in the nerves is not a primary cause of diabetic neuropathy. While infections can affect the nerves, the neuropathy associated with diabetes is primarily due to vascular complications and chronic hyperglycemia, not infections.
C. Excessive glucose exposure to the brain and spinal cord.
Excessive glucose exposure to the brain and spinal cord is not directly related to neuropathy. The neuropathic complications in diabetes are due to the damage of peripheral nerves caused by hyperglycemia and vascular insufficiency, rather than glucose affecting the central nervous system.
D. Inability to provide continuous glucose to the brain and spinal cord.
Inability to provide continuous glucose to the brain and spinal cord is not a cause of neuropathy. The brain and spinal cord typically have a continuous supply of glucose. Neuropathy in diabetes results from the damage to the peripheral nerves due to prolonged high blood glucose levels and subsequent vascular complications.
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Full Explanation
Choice A reason: Neuropathies occur due to the thickening, sclerosis, obstruction, and ischemia of the small blood vessels that supply the nerves (vasa nervorum). Chronic hyperglycemia leads to damage of these blood vessels, reducing blood flow and oxygen supply to the nerves. This ischemia results in nerve degeneration, delayed nerve conduction, and impaired sensory function, which are characteristic of diabetic neuropathy.
Choice B reason: Infection in the nerves is not a primary cause of diabetic neuropathy. While infections can affect the nerves, the neuropathy associated with diabetes is primarily due to vascular complications and chronic hyperglycemia, not infections.
Choice C reason: Excessive glucose exposure to the brain and spinal cord is not directly related to neuropathy. The neuropathic complications in diabetes are due to the damage of peripheral nerves caused by hyperglycemia and vascular insufficiency, rather than glucose affecting the central nervous system.
Choice D reason: Inability to provide continuous glucose to the brain and spinal cord is not a cause of neuropathy. The brain and spinal cord typically have a continuous supply of glucose. Neuropathy in diabetes results from the damage to the peripheral nerves due to prolonged high blood glucose levels and subsequent vascular complications.
Similar Questions
The accumulation of fluid in the peritoneal cavity, is an example of fluid loss, also known as:
A. Edema
Edema refers to the accumulation of fluid in the interstitial spaces of tissues, leading to swelling. While it involves fluid retention, it does not specifically describe fluid accumulation in the peritoneal cavity.
B. Third spacing
Third spacing refers to the abnormal accumulation of fluid in areas where it is not normally found, such as the peritoneal cavity, pleural cavity, or pericardial sac. In the context of the peritoneal cavity, this condition is known as ascites, a type of third spacing.
C. Blanching
Blanching refers to the whitening of the skin when pressure is applied, which is often used as a sign to assess capillary refill time. It does not relate to fluid accumulation.
D. Pitting edema
Pitting edema refers to a type of edema where pressing on the swollen area leaves an indentation or "pit" that takes time to refill. While it is a type of fluid retention, it does not specifically describe fluid accumulation in the peritoneal cavity.
Full Explanation
Choice A reason: Edema refers to the accumulation of fluid in the interstitial spaces of tissues, leading to swelling. While it involves fluid retention, it does not specifically describe fluid accumulation in the peritoneal cavity.
Choice B reason: Third spacing refers to the abnormal accumulation of fluid in areas where it is not normally found, such as the peritoneal cavity, pleural cavity, or pericardial sac. In the context of the peritoneal cavity, this condition is known as ascites, a type of third spacing.
Choice C reason: Blanching refers to the whitening of the skin when pressure is applied, which is often used as a sign to assess capillary refill time. It does not relate to fluid accumulation.
Choice D reason: Pitting edema refers to a type of edema where pressing on the swollen area leaves an indentation or "pit" that takes time to refill. While it is a type of fluid retention, it does not specifically describe fluid accumulation in the peritoneal cavity.
Stress incontinence occurs because of:
A. Medications
While certain medications can affect bladder control, they are not the primary cause of stress incontinence. Stress incontinence is specifically related to physical exertion and increased pressure on the bladder, leading to involuntary urine leakage.
B. Hypertension
Hypertension, or high blood pressure, is not a direct cause of stress incontinence. Stress incontinence is related to the weakening of pelvic floor muscles and increased intra-abdominal pressure rather than blood pressure levels.
C. Full bladder
A full bladder can increase the likelihood of urine leakage in individuals with stress incontinence, but it is not the underlying cause. Stress incontinence occurs due to weakened pelvic floor muscles and increased pressure during physical activities.
D. Exertional stimulus
Stress incontinence occurs due to exertional stimuli that increase intra-abdominal pressure, such as coughing, sneezing, laughing, or physical exercise. These activities cause a sudden increase in pressure on the bladder, leading to involuntary urine leakage. The condition is often associated with weakened pelvic floor muscles, which can result from factors such as childbirth, aging, or pelvic surgery.
Full Explanation
Choice A reason: While certain medications can affect bladder control, they are not the primary cause of stress incontinence. Stress incontinence is specifically related to physical exertion and increased pressure on the bladder, leading to involuntary urine leakage.
Choice B reason: Hypertension, or high blood pressure, is not a direct cause of stress incontinence. Stress incontinence is related to the weakening of pelvic floor muscles and increased intra-abdominal pressure rather than blood pressure levels.
Choice C reason: A full bladder can increase the likelihood of urine leakage in individuals with stress incontinence, but it is not the underlying cause. Stress incontinence occurs due to weakened pelvic floor muscles and increased pressure during physical activities.
Choice D reason: Stress incontinence occurs due to exertional stimuli that increase intra-abdominal pressure, such as coughing, sneezing, laughing, or physical exercise. These activities cause a sudden increase in pressure on the bladder, leading to involuntary urine leakage. The condition is often associated with weakened pelvic floor muscles, which can result from factors such as childbirth, aging, or pelvic surgery.
When increased blood glucose levels stimulate increased secretion of insulin, this is an example of control by:
A. Positive feedback.
Positive feedback mechanisms amplify changes or deviations in the body. They are less common in physiological processes and typically drive processes to completion, such as childbirth and blood clotting. The regulation of blood glucose levels does not operate on a positive feedback mechanism.
B. Releasing hormones.
Releasing hormones are typically involved in the hypothalamic-pituitary axis and the regulation of hormone secretion from other endocrine glands. Examples include thyrotropin-releasing hormone (TRH) and gonadotropin-releasing hormone (GnRH). Insulin secretion in response to blood glucose levels is not directly controlled by releasing hormones.
C. Negative feedback.
Negative feedback is the primary mechanism by which homeostasis is maintained in the body. When blood glucose levels rise, the pancreas secretes insulin to lower blood glucose levels, restoring them to normal. This is an example of negative feedback, as the increase in glucose levels triggers a response (insulin secretion) that counteracts the initial change, bringing blood glucose back to its set point.
D. Ectopic hormones.
Ectopic hormones are hormones produced by tissues that normally do not produce hormones, often in cases of tumors or certain disease conditions. The regulation of insulin in response to blood glucose levels does not involve ectopic hormone production.
Full Explanation
Choice A reason: Positive feedback mechanisms amplify changes or deviations in the body. They are less common in physiological processes and typically drive processes to completion, such as childbirth and blood clotting. The regulation of blood glucose levels does not operate on a positive feedback mechanism.
Choice B reason: Releasing hormones are typically involved in the hypothalamic-pituitary axis and the regulation of hormone secretion from other endocrine glands. Examples include thyrotropin-releasing hormone (TRH) and gonadotropin-releasing hormone (GnRH). Insulin secretion in response to blood glucose levels is not directly controlled by releasing hormones.
Choice C reason: Negative feedback is the primary mechanism by which homeostasis is maintained in the body. When blood glucose levels rise, the pancreas secretes insulin to lower blood glucose levels, restoring them to normal. This is an example of negative feedback, as the increase in glucose levels triggers a response (insulin secretion) that counteracts the initial change, bringing blood glucose back to its set point.
Choice D reason: Ectopic hormones are hormones produced by tissues that normally do not produce hormones, often in cases of tumors or certain disease conditions. The regulation of insulin in response to blood glucose levels does not involve ectopic hormone production.