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The Endocrine System MCAT Questions with
Detailed Verified Answers (100% Correct Answers)
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Exocrine glands
Ans: Release enzymes to the external environment through ducts
Endocrine glands
Ans: Release hormones directly into body fluids
Receptors
Ans: Hormones bind to these proteins and they are highly specific for one
type of hormone
Peptide hormones
Ans: Hormones derived from peptides that may be large or small and often
include carbohydrate portions. Manufactured in the rough ER. Water soluble
Steroid hormones
Ans: Hormones derived from and often chemically similar to cholesterol.
Formed in a series of steps taking place mainly in the smooth ER and
mitochondria. They are lipids and require a protein transport molecule in
order to dissolve into the blood stream
Tyrosine derivatives
Ans: Hormones formed by enzymes in the cytosol or on the rough ER
Sunday, 02 March 2025
, Effector
Ans: Target cell of the peptide hormone, the cell that the hormone is meant
to effect
Intracellular second messenger
Ans: When a peptide hormone binds to a receptor, the receptor may
activate another messenger
Peptide hormones: Anterior pituitary hormones (adenohypophysis)
Ans: GH, LH, FSH, Prolactin, TSH, ACTH
Peptide hormones: Posterior pituitary hormones (neurohypophysis)
Ans: Oxytocin, ADH/Vasopressin
Peptide hormones: Parathyroid hormones
Ans: PTH
Peptide hormones: Pancreatic hormones
Ans: Somatostatin, Insulin, Glucagon
Steroid hormones: glucocorticoids and mineral corticoids of the
adrenal cortex
Ans: Cortisol, androgens, and aldosterone
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