ATI RN
Endocrine System Questions Questions
Question 1 of 5
Most endocrine organs are prodded into action by other hormones; this type of stimulus is called:
Correct Answer: A
Rationale: Hormonal stimuli, like TSH stimulating thyroid hormone release, drive most endocrine activity. Humoral stimuli (e.g., blood calcium for PTH) and neural stimuli (e.g., adrenal medulla) exist, but hormonal is predominant. 'Receptor-mediated' isn't a stimulus type. This prevalence distinguishes endocrine regulation, key to hormonal cascades, contrasting with chemical or nerve triggers.
Question 2 of 5
What stimulates the release of PTH from the parathyroid gland?
Correct Answer: D
Rationale: Low blood calcium triggers parathyroid hormone (PTH) release to raise levels via bone resorption and kidney action. High calcium inhibits, TSH targets thyroid, calcitonin (thyroid-made) lowers calcium. Low calcium stimulus distinguishes PTH regulation, critical for calcium homeostasis, contrasting with inhibitory or unrelated signals.
Question 3 of 5
Which among the following is an Endocrine gland in the human body?
Correct Answer: C
Rationale: The pituitary gland, an endocrine gland, secretes hormones (e.g., GH, TSH) into the bloodstream, dubbed the 'master gland' for regulating others. Salivary, digestive (e.g., pancreas exocrine), and sweat glands are exocrine, using ducts not blood for secretions. Pituitary's ductless, systemic influence distinguishes it, critical for endocrine coordination, contrasting with exocrine functions.
Question 4 of 5
with regard to thyroid physiology
Correct Answer: C
Rationale: T4 (thyroxine) is synthesized from tyrosine in thyroglobulin within thyroid follicles, iodinated to form T3/T4, released to boost metabolism. Metabolism occurs mainly in liver/kidneys, not spleen/bone marrow. T3/T4 act via nuclear receptors, not identical membrane ones T3 is more potent. T4 isn't more active converted to T3 for greater effect. Thyroglobulin's role as a precursor scaffold distinguishes T4 synthesis, key to thyroid hormone production, unlike incorrect metabolism sites, receptor action, or potency claims.
Question 5 of 5
With regard to adrenal function
Correct Answer: B
Rationale: Adrenal medulla, secreting epinephrine/norepinephrine, isn't essential life persists post-adrenalectomy with cortical steroids. Zona fasciculata secretes cortisol, not aldosterone (glomerulosa). ACTH mainly controls cortisol, not glomerulosa's aldosterone (angiotensin II does). Medullary secretion is ~80% epinephrine, not norepinephrine. Non-essentiality distinguishes medulla, key to understanding adrenal roles, unlike zonal, control, or output errors.