BIOL 252 MODULE 4 EXAM 2026/2027 WITH 100 QUESTIONS AND EXPERT-VERIFIED CORRECT ANSWERS | ALREADY GRADED A+ | GUARANTEED PASS

BIOL 252 MODULE 4 EXAM
2026/2027 WITH 100 QUESTIONS
AND EXPERT-VERIFIED
CORRECT ANSWERS | ALREADY
GRADED A+ | GUARANTEED PASS




Section 1: Endocrine System (Questions 1–20)
1. Which hormone is primarily responsible for lowering blood glucose levels?
 A) Glucagon
 B) Epinephrine
 C) Insulin
 D) Cortisol
 Answer: C) Insulin
 Rationale: Insulin, secreted by the beta cells of the pancreas, facilitates the
uptake of glucose into cells, thereby lowering blood glucose levels.
2. The "master gland" that controls other endocrine glands is the:
 A) Thyroid
 B) Adrenal

,  C) Pituitary
 D) Thalamus
 Answer: C) Pituitary
 Rationale: The pituitary gland, specifically the anterior lobe, secretes
several tropic hormones that regulate the activity of other endocrine glands.
3. Which hormone is produced by the pineal gland to regulate sleep-wake
cycles?
 A) Melatonin
 B) Melanin
 C) Calcitonin
 D) Oxytocin
 Answer: A) Melatonin
 Rationale: Melatonin is synthesized by the pineal gland in response to
darkness, helping to synchronize circadian rhythms.
4. Aldosterone is produced by which region of the adrenal gland?
 A) Adrenal medulla
 B) Zona fasciculata
 C) Zona glomerulosa
 D) Zona reticularis
 Answer: C) Zona glomerulosa
 Rationale: The zona glomerulosa is the outermost layer of the adrenal
cortex and produces aldosterone, which regulates sodium and water
balance.
5. What is the primary effect of Parathyroid Hormone (PTH)?
 A) Decrease blood calcium levels
 B) Increase blood calcium levels
 C) Increase blood glucose levels

,  D) Decrease blood pressure
 Answer: B) Increase blood calcium levels
 Rationale: PTH increases blood calcium by stimulating osteoclast activity,
increasing renal calcium reabsorption, and promoting vitamin D activation.
6. Which hormone is released by the posterior pituitary?
 A) Growth hormone
 B) Oxytocin
 C) Prolactin
 D) TSH
 Answer: B) Oxytocin
7. The zona fasciculata of the adrenal cortex produces:
 A) Aldosterone
 B) Cortisol
 C) Epinephrine
 D) Androgens
 Answer: B) Cortisol
8. Which gland is located in the mediastinum and is important for T-cell
maturation?
 A) Thyroid
 B) Thymus
 C) Pineal
 D) Pituitary
 Answer: B) Thymus
9. Diabetes insipidus is caused by a deficiency of:
 A) Insulin
 B) ADH (Antidiuretic hormone)