Similar to neurotransmitters, hormones exert their action only on cells that have specific
The Correct Answer is {"dropdown-group-1":"B"}
A. Gated channels: Some signaling molecules influence ion channels, but hormones do not act only on gated channels - many act via receptors that trigger intracellular cascades.
B. Receptors: Hormones (like neurotransmitters) act only on cells that have specific receptors to which the hormone binds (membrane receptors for peptide hormones or intracellular receptors for lipophilic hormones). This is the correct answer.
C. Enzymes: Hormones can modulate enzymes inside cells, but they require receptors to target cells first; enzymes are not the general targeting mechanism.
D. Cofactors: Cofactors assist enzymatic reactions but are not the specific binding target that determines hormone action on particular cells.
E. Metabolic pathways: Hormones influence metabolic pathways, but they act via receptors on/inside target cells - metabolic pathways are downstream, not the specific binding site.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is {"dropdown-group-1":"D"}
Explanation
A. thymus: The thymus secretes thymosins that influence T-cell maturation (immune function), not hormones that raise blood calcium - so it does not respond to hypocalcemia.
B. thyroid gland: The thyroid’s parafollicular (C) cells secrete calcitonin, which lowers blood calcium in response to hypercalcemia, not hypocalcemia.
C. pituitary gland: The pituitary releases many trophic hormones, but it does not directly secrete the primary hormone (PTH) that corrects hypocalcemia.
D. parathyroid glands: The parathyroid glands secrete parathyroid hormone (PTH) in response to low blood Ca²⁺; PTH raises serum calcium by acting on bone, kidney, and vitamin D activation.
E. pineal gland: The pineal gland secretes melatonin to regulate circadian rhythms, not calcium homeostasis.
Correct Answer is A
Explanation
A. Produces plasma hormones: blood does not produce hormones; endocrine organs secrete hormones into the blood. This statement is not a function of blood.
B. Transports a variety of nutrients: this is a function of blood (plasma carries nutrients to tissues).
C. Helps to stabilize the pH of extracellular fluids: this is a function; blood buffers (bicarbonate, proteins) help stabilize pH.
D. Helps to regulate body temperature: this is a function; blood redistributes heat and helps maintain temperature.
E. Participates in the initiation of blood clotting: this is a function; platelets and plasma clotting factors in blood participate in clot formation.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.