ATI RN
Endocrine System Questions Questions
Question 1 of 5
The secretions from which of these glands differs between males and females?
Correct Answer: C
Rationale: Gonadal glands (testes, ovaries) differ: testes secrete testosterone, ovaries estrogens/progesterone, defining sex-specific traits. Adrenal, parathyroid, and pancreas secretions (e.g., cortisol, PTH, insulin) are similar across sexes. Gonadal variation distinguishes it, critical for reproductive endocrinology, contrasting with universal hormones.
Question 2 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 3 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 4 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.
Question 5 of 5
Which is false
Correct Answer: B
Rationale: Free cortisol feeds back negatively on both pituitary (ACTH) and hypothalamus (CRH) false to exclude hypothalamus. Suprachiasmatic nuclei drive ACTH's diurnal rhythm. Haemorrhage boosts aldosterone (RAAS) and cortisol (stress). Testosterone inhibits LH. Hypothalamic feedback distinguishes cortisol's regulation, key to HPA axis, unlike rhythm, stress, or gonadal truths.