Steroid hormones exert their action by.
entering the nucleus of a cell and initiating or altering the expression of a gene
finding an appropriate cell receptor and initiating cAMP activity
stimulating the synthesis of a glycogen
increasing blood pressure
The Correct Answer is A
a) Entering the nucleus of a cell and initiating or altering the expression of a gene: Steroid hormones (e.g., cortisol, estrogen) are lipid-soluble and can pass through the cell membrane to bind intracellular receptors, influencing gene transcription.
b) Finding an appropriate cell receptor and initiating cAMP activity: This describes non-steroid hormones (e.g., catecholamines, peptide hormones) using second messenger systems, not steroids.
c) Stimulating the synthesis of glycogen: This is an effect of some hormones (e.g., insulin), but it’s not how steroid hormones act.
d) Increasing blood pressure: While some steroid hormones (like aldosterone) may affect blood pressure, this is not their mechanism of action.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
a) Triiodothyronine (T3) and thyroxine (T4) production continues uninterrupted.
Iodinated thyroglobulin is essential for producing T3 and T4.
b) Excess triiodothyronine (T3) and thyroxine (T4) hormones are produced.
A lack of iodinated thyroglobulin leads to decreased production.
c) Less triiodothyronine (T3) and thyroxine (T4) hormones are produced.
Without iodinated thyroglobulin, the thyroid cannot synthesize sufficient T3 and T4, leading to hypothyroidism.
d) Less thyroid-stimulating hormone (TSH) is released.
TSH levels would actually increase due to lack of negative feedback from low T3 and T4 levels.
Correct Answer is C
Explanation
a) Hypercalcemia: High calcium levels inhibit PTH secretion via negative feedback.
b) Cold temperatures: PTH release is not influenced by ambient temperature.
c) Hypocalcemia: Low calcium levels stimulate the parathyroid glands to release PTH to increase calcium concentration.
d) Low basal metabolic rate: This relates more to thyroid hormone activity than to calcium regulation.
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