Which of the following hormones is responsible for decreasing blood calcium?
Parathyroid hormone (PTH)
Insulin
T3/T4
Calcitonin
The Correct Answer is D
A. Parathyroid hormone (PTH): Raises blood calcium by stimulating bone resorption and increasing renal calcium reabsorption.
B. Insulin: Regulates blood glucose and has metabolic effects, but it does not lower blood calcium.
C. T3/T4: Thyroid hormones that regulate metabolism broadly, not the primary hormones for lowering blood calcium.
D. Calcitonin: Secreted by the thyroid (C cells) and lowers blood calcium by inhibiting osteoclast activity and promoting calcium deposition in bone.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. pH 7.40: Near normal arterial blood pH; hydrogen ion concentration is lower than at more acidic pH values.
B. pH 7.35: Slightly more acidic than 7.40, so hydrogen ion concentration is higher than at 7.40.
C. pH 7.45: Slightly more alkaline than 7.40, so hydrogen ion concentration is lower than at 7.40.
D. pH 7.28: The lowest pH listed (most acidic), therefore it has the highest hydrogen ion (H⁺) concentration.
Correct Answer is A
Explanation
A. Endometrium: This is the inner uterine lining where a fertilized embryo normally implants and begins to develop.
B. Fallopian tube: While fertilization usually occurs here, implantation in this site results in an ectopic pregnancy.
C. Cervix: The cervix is the lower part of the uterus and is not a site of normal implantation.
D. Perimetrium: This is the outermost uterine layer that provides structural covering, not the site of implantation.
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