BIO 252 FINAL EXAM (QUESTIONS) QUESTIONS AND ANSWERS
WITH RATIONALES/GRADED A+/2026 UPDATE/100% CORRECT
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Section 1: Endocrine System (Questions 1-35)
1. Which of the following is a characteristic of the endocrine system compared to the nervous
system?
A. Responses are faster and shorter in duration
B. Responses are slower and longer in duration
C. Responses are limited to voluntary actions
D. Responses only occur during sleep
Answer: B
Rationale: The endocrine system acts via hormones distributed through the bloodstream,
producing slower but longer-lasting effects. The nervous system produces rapid, short-lived
effects (A). Both systems are largely involuntary (C).
2. Hormones are chemical messengers that are secreted directly into:
A. Ducts
B. The bloodstream (extracellular fluid)
C. The digestive tract
D. The urinary tract
Answer: B
Rationale: Endocrine glands are ductless and secrete hormones directly into the bloodstream
(or interstitial fluid). Exocrine glands (A) secrete through ducts. The digestive tract (C) and
urinary tract (D) are not primary routes for hormone secretion.
3. Which of the following is classified as a steroid hormone?
A. Insulin
, B. Epinephrine
C. Cortisol
D. Oxytocin
Answer: C
Rationale: Cortisol is a steroid hormone derived from cholesterol. Insulin (A) and oxytocin (D) are
peptide/protein hormones. Epinephrine (B) is a catecholamine (amine hormone).
4. Steroid hormones exert their effects by:
A. Binding to cell surface receptors and activating second messengers
B. Diffusing through the cell membrane and binding to intracellular receptors (nuclear or
cytoplasmic)
C. Activating G proteins on the cell membrane
D. Opening ion channels directly
Answer: B
Rationale: Steroid hormones are lipid-soluble, diffuse across the plasma membrane, and bind to
intracellular receptors to regulate gene transcription. Peptide hormones (A, C) use second
messengers. Ion channels (D) are typically for neurotransmitters.
5. Which gland is often called the "master gland" because it controls other endocrine glands?
A. Thyroid gland
B. Adrenal gland
C. Pituitary gland (hypophysis)
D. Pancreas
Answer: C
Rationale: The pituitary gland (specifically the anterior pituitary) secretes tropic hormones that
regulate the thyroid, adrenal cortex, and gonads. The thyroid (A) regulates metabolism. Adrenal
(B) produces stress hormones. Pancreas (D) regulates blood glucose.
6. The anterior pituitary (adenohypophysis) secretes all of the following EXCEPT:
A. Growth hormone (GH)
B. Thyroid-stimulating hormone (TSH)
WITH RATIONALES/GRADED A+/2026 UPDATE/100% CORRECT
/INSTANT DOWNLOAD
Section 1: Endocrine System (Questions 1-35)
1. Which of the following is a characteristic of the endocrine system compared to the nervous
system?
A. Responses are faster and shorter in duration
B. Responses are slower and longer in duration
C. Responses are limited to voluntary actions
D. Responses only occur during sleep
Answer: B
Rationale: The endocrine system acts via hormones distributed through the bloodstream,
producing slower but longer-lasting effects. The nervous system produces rapid, short-lived
effects (A). Both systems are largely involuntary (C).
2. Hormones are chemical messengers that are secreted directly into:
A. Ducts
B. The bloodstream (extracellular fluid)
C. The digestive tract
D. The urinary tract
Answer: B
Rationale: Endocrine glands are ductless and secrete hormones directly into the bloodstream
(or interstitial fluid). Exocrine glands (A) secrete through ducts. The digestive tract (C) and
urinary tract (D) are not primary routes for hormone secretion.
3. Which of the following is classified as a steroid hormone?
A. Insulin
, B. Epinephrine
C. Cortisol
D. Oxytocin
Answer: C
Rationale: Cortisol is a steroid hormone derived from cholesterol. Insulin (A) and oxytocin (D) are
peptide/protein hormones. Epinephrine (B) is a catecholamine (amine hormone).
4. Steroid hormones exert their effects by:
A. Binding to cell surface receptors and activating second messengers
B. Diffusing through the cell membrane and binding to intracellular receptors (nuclear or
cytoplasmic)
C. Activating G proteins on the cell membrane
D. Opening ion channels directly
Answer: B
Rationale: Steroid hormones are lipid-soluble, diffuse across the plasma membrane, and bind to
intracellular receptors to regulate gene transcription. Peptide hormones (A, C) use second
messengers. Ion channels (D) are typically for neurotransmitters.
5. Which gland is often called the "master gland" because it controls other endocrine glands?
A. Thyroid gland
B. Adrenal gland
C. Pituitary gland (hypophysis)
D. Pancreas
Answer: C
Rationale: The pituitary gland (specifically the anterior pituitary) secretes tropic hormones that
regulate the thyroid, adrenal cortex, and gonads. The thyroid (A) regulates metabolism. Adrenal
(B) produces stress hormones. Pancreas (D) regulates blood glucose.
6. The anterior pituitary (adenohypophysis) secretes all of the following EXCEPT:
A. Growth hormone (GH)
B. Thyroid-stimulating hormone (TSH)
