Which organ plays a central role in regulating blood glucose levels by secreting insulin and glucagon?
Liver.
Kidneys.
Lungs.
Spleen.
The Correct Answer is A
The liver plays a central role in blood glucose regulation by releasing glucose into the bloodstream through glycogenolysis and gluconeogenesis when blood glucose levels are low. It also stores glucose as glycogen and responds to insulin and glucagon signals.
Incorrect choices:
b. This choice is incorrect. While the kidneys play a role in filtering blood and excreting waste products, they are not primarily responsible for regulating blood glucose levels.
c. This choice is incorrect. The lungs are involved in oxygen and carbon dioxide exchange and are not directly involved in blood glucose regulation.
d. This choice is incorrect. The spleen is involved in immune function and blood filtration, but it does not play a central role in blood glucose regulation.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Diabetic retinopathy is a complication of diabetes mellitus that affects the blood vessels of the retina, leading to vision impairment and potential blindness. It is a result of prolonged high blood glucose levels damaging the small blood vessels in the eye.
Incorrect choices:
a. This choice is incorrect. Diabetic ketoacidosis (DKA) is an acute complication characterized by high blood glucose levels, ketosis, and metabolic acidosis.
b. This choice is incorrect. Diabetic nephropathy is a chronic complication that affects the kidneys and can lead to impaired kidney function.
c. This choice is incorrect. Diabetic neuropathy refers to nerve damage due to diabetes and can cause symptoms such as tingling, pain, and loss of sensation in the extremities.
Correct Answer is A
Explanation
Type 1 diabetes mellitus is an autoimmune condition in which the body's immune system attacks and destroys pancreatic beta cells, resulting in a lack of insulin production.
Incorrect choices:
b. This choice is incorrect. Type 2 diabetes mellitus is characterized by insulin resistance and impaired insulin secretion, but pancreatic beta cells are not completely destroyed.
c. This choice is incorrect. Gestational diabetes mellitus occurs during pregnancy and is not caused by autoimmune destruction of pancreatic beta cells.
d. This choice is incorrect. Prediabetes is a condition in which blood glucose levels are higher than normal but not high enough to be classified as diabetes. It is not characterized by autoimmune destruction of beta cells.
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