What is the MOST likely effect of a deficiency of aldosterone?
Low blood volume and hypotension
High blood pressure
Low blood potassium levels
Goiter formation
The Correct Answer is A
A. Low blood volume and hypotension: Aldosterone promotes sodium and water retention; its deficiency leads to fluid loss and low BP.
B. High blood pressure: Aldosterone excess, not deficiency, would raise BP.
C. Low blood potassium levels: Aldosterone promotes potassium excretion; deficiency would raise potassium levels.
D. Goiter formation: Goiter is associated with thyroid dysfunction, not aldosterone.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. During labor, pressure of baby's head on cervix stimulates release of oxytocin:
This is a classic example of positive feedback-oxytocin increases uterine contractions, which increase pressure and stimulate more oxytocin release.
B. Menstrual cycle:
The menstrual cycle involves both positive and negative feedback mechanisms, but is not a pure example of positive feedback.
C. Blood glucose regulation:
This is an example of negative feedback involving insulin and glucagon.
D. Wake/sleep cycle:
This is regulated by circadian rhythms, not primarily a feedback loop of endocrine hormones.
Correct Answer is D
Explanation
A. Over secretion of aldosterone: Aldosterone promotes water reabsorption, which reduces urine output.
B. Decreased GFR (glomerular filtration rate): This would lead to less urine formation, not polyuria.
C. Activation of angiotensinogen: This ultimately leads to water retention, not increased urination.
D. Deficiency of ADH: ADH (antidiuretic hormone) promotes water reabsorption. Its deficiency (as in diabetes insipidus) leads to excessive urine output.
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