What is a common inhibitory neurotransmitter?
Gamma-aminobutyric acid
Norepinephrine
Histamine
Glutamate
The Correct Answer is A
Choice A reason: Gamma-aminobutyric acid (GABA) is the primary inhibitory neurotransmitter in the central nervous system, reducing neuronal excitability by opening chloride channels, hyperpolarizing neurons, and preventing action potentials, making this the correct choice.
Choice B reason: Norepinephrine is an excitatory neurotransmitter and hormone, increasing neuronal activity and arousal in the sympathetic nervous system. It does not inhibit neural signaling, making this choice incorrect for an inhibitory neurotransmitter.
Choice C reason: Histamine acts as a neurotransmitter promoting wakefulness and arousal, not inhibition. It stimulates neuronal activity in the brain, unlike inhibitory neurotransmitters that reduce firing, making this choice incorrect for the role.
Choice D reason: Glutamate is the primary excitatory neurotransmitter, promoting neuronal firing by depolarizing neurons via ion channel activation. It does not inhibit neural activity, making this choice incorrect for an inhibitory neurotransmitter.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A reason: Acidosis does not enhance gastrointestinal potassium absorption. Hyperkalemia in acidosis results from cellular shifts, not increased absorption, as hydrogen ions affect potassium movement, making this choice incorrect.
Choice B reason: Acidosis does not increase renal potassium excretion; it causes hyperkalemia by shifting potassium out of cells. Hypokalemia may occur in alkalosis, not acidosis, making this choice incorrect.
Choice C reason: Acidosis causes hyperkalemia as excess hydrogen ions enter cells to buffer pH, displacing potassium into the bloodstream. This cellular shift elevates serum potassium, making this the correct choice.
Choice D reason: Acidosis promotes potassium release from cells, not uptake, causing hyperkalemia. Hypokalemia occurs in alkalosis, where potassium enters cells, making this choice incorrect for acidosis effects.
Correct Answer is A
Explanation
Choice A reason: Hypertrophy is the increase in cell size due to increased workload, as seen in heart failure where cardiac myocytes enlarge to compensate for increased demand. This adaptation enhances pumping capacity initially but may lead to dysfunction, making this the correct choice for cardiac enlargement.
Choice B reason: Dysplasia involves abnormal cell growth and differentiation, often precancerous, typically in epithelial tissues. It is not a response to increased workload in the heart, which requires cell enlargement, not abnormal development, making this choice incorrect for heart failure adaptation.
Choice C reason: Neoplasia refers to uncontrolled cell growth forming tumors, benign or malignant, and is not a response to heart failure. Cardiac enlargement in heart failure results from adaptive hypertrophy, not tumor formation, making this choice incorrect for the described cellular adaptation.
Choice D reason: Metaplasia is the reversible replacement of one cell type with another, often due to chronic irritation (e.g., in smokers’ lungs). It does not occur in cardiac muscle under heart failure stress, which involves cell size increase, making this choice incorrect.
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