USMLE STEP 1 ENDOCRINOLOGY Questions and Answers with Complete Solutions 2024

USMLE STEP 1 ENDOCRINOLOGY Questions and Answers with Complete Solutions 2024 what is the embryonal origin of the adrenal cortex? - ANSmesoderm what is the embryonal origin of the adrenal medulla? what are the cells of the adrenal medulla called? - ANSneural crest; chromaffin cells T/F the chromaffin cells of the adrenal cortex are are considered preganglionic - ANSfalse- postganglionic and ganglionic sympathetic what autonomic is the adrenal medulla innervated by? what are the NT? what are the receptors called? what kind of receptors are they? - ANSsympathetic; Ach; nicotinic (N); Na+/K ligand gated channels what are the three layers of the adrenal cortex? (in order from outside to inside) which is the biggest? - ANSZona Glomerulosa, Zona Fasciculata, Zona Reticularis; Zona Fasciulata what is the regulatory control of zona glomerulosa? and what does it produce in response? - ANSrenin-angiontensin (Ang II); Aldosterone what is the regulatory control of the zona fasciculata? and what does it produce in response? - ANSACTH from ant pit (CRH from Hypothalamus); corticosteroids what is the regulatory control of the zona reticularis? and what does it produce in response? - ANSACTH (ant pit) and CRH (Hypothalamus); sex androgens what is the regulatory control of the adrenal medulla? what is secreted in response? - ANSpreganglionic sympathetic fibers; catecholamines (epi, NE) from what aa are catecholamines made? - ANStyrosine what is the most common tumor of the adrenal medulla in adults? - ANSphechromocytoma