ATI RN
Multiple Choice Questions Endocrine System Questions
Question 1 of 5
The release of oxytocin is controlled by feedback.
Correct Answer: C
Rationale: Oxytocin release (e.g., labor) uses positive feedback uterine contractions increase oxytocin, amplifying delivery. Negative feedback stabilizes (e.g., cortisol). 'Neutral' isn't a mechanism undefined. 'Hormonal' isn't feedback type control mode. Positive feedback distinguishes oxytocin's escalating role, critical for childbirth, unlike stabilizing or vague options.
Question 2 of 5
Which of the following is NOT true of parathyroid hormone action?
Correct Answer: B
Rationale: PTH doesn't decrease blood calcium it raises it via bone release, kidney reabsorption, and vitamin D activation (1,25-DHC) all increase Ca²âº. Decreasing calcium is calcitonin's role, not PTH opposite action. PTH's consistent elevation distinguishes it, critical for hypocalcemia correction, unlike erroneous lowering claim.
Question 3 of 5
Cortisol is produced by the:
Correct Answer: A
Rationale: Cortisol, a glucocorticoid, is produced by adrenal cortex's zona fasciculata stress/metabolism regulation. Medulla makes epinephrine, not steroids. Anterior pituitary releases ACTH, stimulating cortisol, not producing. Pancreas secretes insulin/glucagon glucose focus. Cortex's steroid synthesis distinguishes it, critical for cortisol's role, unlike neural, regulatory, or metabolic glands.
Question 4 of 5
Which of the following symptoms of diabetes mellitus is correctly matched to its description?
Correct Answer: D
Rationale: Glycosuria means excessive sugar in urine glucose spills over renal threshold in diabetes mellitus, correct match. Polyuria is excessive urine (not thirst polydipsia). Polyphagia is excessive hunger (not ketones ketonuria). Polydipsia is thirst (not urine). Glycosuria's sugar-urine link distinguishes it, key to hyperglycemia's renal effect, unlike mismatched symptoms.
Question 5 of 5
Most hormones travel from the gland where they were produced to the tissues and cells which they act upon:
Correct Answer: C
Rationale: Hormones travel in the bloodstream from endocrine glands (e.g., thyroid) to target tissues (e.g., muscles), enabling systemic effects like metabolism regulation (T3/T4). Nerve fibres and synapses are neural neurotransmitters act locally, not hormonally. Ducts are exocrine (e.g., pancreas digestion), not endocrine hormones are ductless. Diffusion suits paracrine signaling, not distant endocrine targets. Bloodstream transport distinguishes endocrine reach, critical for widespread chemical signaling, unlike neural, exocrine, or local mechanisms.