BIOD 152 MODULE 3 ACTUAL EXAM 2026/2027 | Portage Learning |
26 Questions with Rationales | Complete Answer Key | Pass
Guaranteed - A+ Graded
Q1: Which of the following best distinguishes endocrine glands from exocrine glands?
A. Endocrine glands secrete substances through ducts to epithelial surfaces
B. Exocrine glands release hormones directly into the bloodstream
C. Endocrine glands are ductless and secrete hormones into the bloodstream
[CORRECT]
D. Exocrine glands function only in the digestive system
Correct Answer: C
Rationale: The fundamental distinction between endocrine and exocrine glands is the
presence or absence of ducts. Endocrine glands are ductless and secrete hormones
directly into the bloodstream, which then transport these chemical messengers to
target cells throughout the body. Exocrine glands, by contrast, possess ducts that
transport their secretions (enzymes, sweat, oil, mucus) to epithelial surfaces or body
cavities.
Distractor analysis:
● A is incorrect: This describes exocrine glands, not endocrine glands. The duct
system is characteristic of exocrine secretion.
● B is incorrect: This reverses the definitions. Exocrine glands do not release
hormones into blood; endocrine glands do.
● D is incorrect: While many exocrine glands are associated with digestion (salivary
glands, pancreas exocrine portion, liver), exocrine glands are found throughout
the body (sweat glands, sebaceous glands, mammary glands, lacrimal glands).
Clinical correlation: Understanding this distinction is essential for recognizing why
endocrine disorders present with systemic symptoms (diabetes affects multiple organ
,systems via insulin deficiency) while exocrine pancreatic insufficiency primarily causes
digestive problems (malabsorption due to lack of digestive enzymes).
Q2 (Matching): Match each endocrine gland to its primary location in the body:
TableCopy
Gland Location
1. Thyroid A. Superior to kidneys, retroperitoneal
2. Adrenal B. Base of the brain, sella turcica
3. Pituitary C. Anterior neck, trachea level
4. Parathyroid D. Posterior surface of thyroid lobes
Correct Answer: 1-C, 2-A, 3-B, 4-D [CORRECT]
Rationale:
● Thyroid (1-C): Located in the anterior neck, immediately anterior to the trachea at
the level of the thyroid cartilage (C5-T1). Its two lateral lobes are connected by
the isthmus.
● Adrenal (2-A): Paired glands located superior to each kidney in the retroperitoneal
space. The right adrenal is pyramidal; the left is semilunar.
● Pituitary (3-B): The "master gland" sits in the sella turcica of the sphenoid bone at
the base of the brain, connected to the hypothalamus by the infundibulum (stalk).
● Parathyroid (4-D): Four small glands (typically) embedded in the posterior
surface of the thyroid gland lobes.
Common errors to avoid:
, ● Confusing adrenal location (superior to kidneys) with kidney location itself
● Thinking parathyroid glands are separate from thyroid rather than embedded in it
● Misplacing pituitary in the cerebral cortex rather than base of brain
Q3 (Short Answer): Explain the hypothalamic-pituitary-target gland axis using the thyroid
gland as your example. Include: (1) the releasing hormone from the hypothalamus, (2)
the tropic hormone from the anterior pituitary, (3) the final hormone(s) from the target
gland, and (4) the type of feedback that regulates this system.
Correct Answer:
1. TRH (Thyrotropin-releasing hormone) from hypothalamus
2. TSH (Thyroid-stimulating hormone/thyrotropin) from anterior pituitary
3. T3 (triiodothyronine) and T4 (thyroxine) from thyroid follicular cells
4. Negative feedback — rising T3/T4 levels inhibit TRH and TSH release [CORRECT]
Rationale: This question assesses understanding of the hierarchical control of
endocrine function. The hypothalamus produces releasing hormones that stimulate the
anterior pituitary to secrete tropic hormones, which then stimulate peripheral endocrine
glands. The thyroid axis exemplifies this perfectly:
● TRH travels via the hypophyseal portal system to anterior pituitary thyrotrophs
● TSH binds to receptors on thyroid follicular cells, stimulating iodine uptake,
hormone synthesis, and release
● T4 is the primary secretory product; T3 (more active) is produced by peripheral
conversion
● Negative feedback maintains homeostasis — elevated thyroid hormones
suppress hypothalamic and pituitary activity
Grading criteria: Full credit requires all four components with correct hormone names
and identification of negative feedback. Partial credit for missing one component or
confusing anterior/posterior pituitary.
26 Questions with Rationales | Complete Answer Key | Pass
Guaranteed - A+ Graded
Q1: Which of the following best distinguishes endocrine glands from exocrine glands?
A. Endocrine glands secrete substances through ducts to epithelial surfaces
B. Exocrine glands release hormones directly into the bloodstream
C. Endocrine glands are ductless and secrete hormones into the bloodstream
[CORRECT]
D. Exocrine glands function only in the digestive system
Correct Answer: C
Rationale: The fundamental distinction between endocrine and exocrine glands is the
presence or absence of ducts. Endocrine glands are ductless and secrete hormones
directly into the bloodstream, which then transport these chemical messengers to
target cells throughout the body. Exocrine glands, by contrast, possess ducts that
transport their secretions (enzymes, sweat, oil, mucus) to epithelial surfaces or body
cavities.
Distractor analysis:
● A is incorrect: This describes exocrine glands, not endocrine glands. The duct
system is characteristic of exocrine secretion.
● B is incorrect: This reverses the definitions. Exocrine glands do not release
hormones into blood; endocrine glands do.
● D is incorrect: While many exocrine glands are associated with digestion (salivary
glands, pancreas exocrine portion, liver), exocrine glands are found throughout
the body (sweat glands, sebaceous glands, mammary glands, lacrimal glands).
Clinical correlation: Understanding this distinction is essential for recognizing why
endocrine disorders present with systemic symptoms (diabetes affects multiple organ
,systems via insulin deficiency) while exocrine pancreatic insufficiency primarily causes
digestive problems (malabsorption due to lack of digestive enzymes).
Q2 (Matching): Match each endocrine gland to its primary location in the body:
TableCopy
Gland Location
1. Thyroid A. Superior to kidneys, retroperitoneal
2. Adrenal B. Base of the brain, sella turcica
3. Pituitary C. Anterior neck, trachea level
4. Parathyroid D. Posterior surface of thyroid lobes
Correct Answer: 1-C, 2-A, 3-B, 4-D [CORRECT]
Rationale:
● Thyroid (1-C): Located in the anterior neck, immediately anterior to the trachea at
the level of the thyroid cartilage (C5-T1). Its two lateral lobes are connected by
the isthmus.
● Adrenal (2-A): Paired glands located superior to each kidney in the retroperitoneal
space. The right adrenal is pyramidal; the left is semilunar.
● Pituitary (3-B): The "master gland" sits in the sella turcica of the sphenoid bone at
the base of the brain, connected to the hypothalamus by the infundibulum (stalk).
● Parathyroid (4-D): Four small glands (typically) embedded in the posterior
surface of the thyroid gland lobes.
Common errors to avoid:
, ● Confusing adrenal location (superior to kidneys) with kidney location itself
● Thinking parathyroid glands are separate from thyroid rather than embedded in it
● Misplacing pituitary in the cerebral cortex rather than base of brain
Q3 (Short Answer): Explain the hypothalamic-pituitary-target gland axis using the thyroid
gland as your example. Include: (1) the releasing hormone from the hypothalamus, (2)
the tropic hormone from the anterior pituitary, (3) the final hormone(s) from the target
gland, and (4) the type of feedback that regulates this system.
Correct Answer:
1. TRH (Thyrotropin-releasing hormone) from hypothalamus
2. TSH (Thyroid-stimulating hormone/thyrotropin) from anterior pituitary
3. T3 (triiodothyronine) and T4 (thyroxine) from thyroid follicular cells
4. Negative feedback — rising T3/T4 levels inhibit TRH and TSH release [CORRECT]
Rationale: This question assesses understanding of the hierarchical control of
endocrine function. The hypothalamus produces releasing hormones that stimulate the
anterior pituitary to secrete tropic hormones, which then stimulate peripheral endocrine
glands. The thyroid axis exemplifies this perfectly:
● TRH travels via the hypophyseal portal system to anterior pituitary thyrotrophs
● TSH binds to receptors on thyroid follicular cells, stimulating iodine uptake,
hormone synthesis, and release
● T4 is the primary secretory product; T3 (more active) is produced by peripheral
conversion
● Negative feedback maintains homeostasis — elevated thyroid hormones
suppress hypothalamic and pituitary activity
Grading criteria: Full credit requires all four components with correct hormone names
and identification of negative feedback. Partial credit for missing one component or
confusing anterior/posterior pituitary.
