BIOL 252 -HUMAN ANATOMY AND PHYSIOLOGY II-MODULE 2 EXAM –
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1. A 45-year-old male presents to the clinic with chronic fatigue, weight gain, and cold
intolerance. Laboratory tests reveal elevated TSH and low free T4 levels. Which of the
following best describes the underlying physiological mechanism responsible for this
patient's clinical presentation?
A. Hypersecretion of thyroid hormones due to a pituitary adenoma
B. Autoimmune destruction of thyroid follicular cells leading to decreased hormone synthesis
C. Peripheral resistance to circulating thyroid hormones at the cellular receptor level
D. Iodine toxicity causing suppression of the hypothalamic-pituitary-thyroid axis
Rationale: Primary hypothyroidism, commonly caused by Hashimoto's thyroiditis, involves the
autoimmune destruction of thyroid follicular cells, resulting in decreased production of T3
and T4. The resulting low circulating thyroid hormones remove negative feedback on the
anterior pituitary, leading to elevated TSH. Hypersecretion would cause hyperthyroidism,
while peripheral resistance presents with high T4 and high TSH.
2. During a routine physical examination, a patient is noted to have a persistent blood
pressure reading of 165/105 mmHg. Diagnostic workup uncovers a unilateral adrenal mass
hypersecreting aldosterone. What primary electrolyte disturbance is expected in this
patient?
A. Hyperkalemia and metabolic acidosis
B. Hypokalemia and metabolic alkalosis
C. Hypercalcemia and hyperphosphatemia
D. Hyponatremia and hyperkalemia
Rationale: Aldosterone acts on the principal cells of the distal convoluted tubules and cortical
collecting ducts to stimulate sodium reabsorption and potassium/hydrogen ion secretion.
Excess aldosterone (Conn's syndrome) leads to excessive renal excretion of potassium and
hydrogen ions, resulting in hypokalemia and metabolic alkalosis.
,3. A patient with a history of severe head trauma develops excessive thirst, polydipsia, and
copious amounts of dilute urine with a low specific gravity. Which endocrine structure and
hormone are primarily implicated in this clinical scenario?
A. Anterior pituitary gland and growth hormone
B. Posterior pituitary gland and antidiuretic hormone
C. Adrenal medulla and epinephrine
D. Pancreatic beta cells and insulin
Rationale: Diabetes insipidus results from a deficiency of antidiuretic hormone (ADH), which
is synthesized in the hypothalamus and stored/released by the posterior pituitary. Without
ADH, the collecting ducts of the kidneys become impermeable to water, leading to the inability
to concentrate urine and resulting in polyuria and polydipsia.
4. A 30-year-old female undergoes laboratory evaluation for infertility and irregular
menses. Results indicate elevated prolactin levels. Which of the following hypothalamic
factors exerts the primary inhibitory control over the secretion of this hormone?
A. Somatostatin
B. Thyrotropin-releasing hormone
C. Dopamine
D. Gonadotropin-releasing hormone
Rationale: Prolactin secretion is uniquely tonically inhibited by dopamine (prolactin-inhibiting
hormone) released from the hypothalamus. A reduction in dopamine tone or stalk
compression leads to hyperprolactinemia, which suppresses GnRH and causes hypogonadism.
5. Which of the following formed elements of the blood is correctly matched with its
primary physiological function?
A. Neutrophils: Production of antibodies during humoral immune responses
B. Erythrocytes: Transport of oxygen and carbon dioxide via hemoglobin
C. Platelets: Phagocytosis of cellular debris and antigen presentation
D. Basophils: Direct cytotoxicity against viral-infected host cells
Rationale: Erythrocytes (red blood cells) are specialized containers for hemoglobin, which
efficiently binds and transports oxygen from the lungs to tissues and assists in carbon dioxide
transport. Neutrophils are phagocytic, platelets are involved in hemostasis, and basophils
release histamine in allergic responses.
, 6. A patient is diagnosed with iron-deficiency anemia following routine blood work showing
microcytic, hypochromic red blood cells. Which laboratory parameter is expected to be
elevated in this condition?
A. Serum ferritin
B. Total iron-binding capacity (TIBC)
C. Serum iron
D. Transferrin saturation
Rationale: In iron-deficiency anemia, body iron stores are depleted, leading to a compensatory
liver increase in the synthesis of transferrin to capture any available iron. Therefore, total
iron-binding capacity (TIBC) increases, while serum iron, ferritin, and transferrin saturation
decrease.
7. An individual with type A blood receives a transfusion of type AB packed red blood cells.
Which of the following immunologic events is most likely to occur?
A. No adverse reaction because type A blood lacks antibodies against type AB antigens
B. Agglutination of the transfused red blood cells by the recipient's pre-formed anti-B antibodies
C. Immediate hemolysis mediated entirely by cell-mediated T-lymphocyte cytotoxicity
D. Sensitization without immediate reaction followed by delayed hypersensitivity
Rationale: Type A individuals possess natural anti-B antibodies in their plasma. When
transfused with type AB blood, the donor red blood cells carry B antigens, which react with
the recipient's anti-B antibodies, causing acute antibody-mediated agglutination and
hemolysis.
8. During hemostasis, which of the following clotting factors is responsible for cross-linking
fibrin polymers to form a stable, insoluble hemostatic plug?
A. Factor I (Fibrinogen)
B. Factor III (Tissue Factor)
C. Factor VIII (Antihemophilic factor)
D. Factor XIII (Fibrin-stabilizing factor)
Rationale: Factor XIIIa, activated by thrombin in the presence of calcium, is a
transglutaminase that catalyzes the formation of covalent bonds between fibrin strands,
transforming loose fibrin monomers into a dense, cross-linked, mechanically stable clot.
QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED
ANSWERS PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM
UPDATE | EXAM PREP | STUDY GUIDE | PRACTICE TEST| DOWNLOAD
INSTANT PDF
1. A 45-year-old male presents to the clinic with chronic fatigue, weight gain, and cold
intolerance. Laboratory tests reveal elevated TSH and low free T4 levels. Which of the
following best describes the underlying physiological mechanism responsible for this
patient's clinical presentation?
A. Hypersecretion of thyroid hormones due to a pituitary adenoma
B. Autoimmune destruction of thyroid follicular cells leading to decreased hormone synthesis
C. Peripheral resistance to circulating thyroid hormones at the cellular receptor level
D. Iodine toxicity causing suppression of the hypothalamic-pituitary-thyroid axis
Rationale: Primary hypothyroidism, commonly caused by Hashimoto's thyroiditis, involves the
autoimmune destruction of thyroid follicular cells, resulting in decreased production of T3
and T4. The resulting low circulating thyroid hormones remove negative feedback on the
anterior pituitary, leading to elevated TSH. Hypersecretion would cause hyperthyroidism,
while peripheral resistance presents with high T4 and high TSH.
2. During a routine physical examination, a patient is noted to have a persistent blood
pressure reading of 165/105 mmHg. Diagnostic workup uncovers a unilateral adrenal mass
hypersecreting aldosterone. What primary electrolyte disturbance is expected in this
patient?
A. Hyperkalemia and metabolic acidosis
B. Hypokalemia and metabolic alkalosis
C. Hypercalcemia and hyperphosphatemia
D. Hyponatremia and hyperkalemia
Rationale: Aldosterone acts on the principal cells of the distal convoluted tubules and cortical
collecting ducts to stimulate sodium reabsorption and potassium/hydrogen ion secretion.
Excess aldosterone (Conn's syndrome) leads to excessive renal excretion of potassium and
hydrogen ions, resulting in hypokalemia and metabolic alkalosis.
,3. A patient with a history of severe head trauma develops excessive thirst, polydipsia, and
copious amounts of dilute urine with a low specific gravity. Which endocrine structure and
hormone are primarily implicated in this clinical scenario?
A. Anterior pituitary gland and growth hormone
B. Posterior pituitary gland and antidiuretic hormone
C. Adrenal medulla and epinephrine
D. Pancreatic beta cells and insulin
Rationale: Diabetes insipidus results from a deficiency of antidiuretic hormone (ADH), which
is synthesized in the hypothalamus and stored/released by the posterior pituitary. Without
ADH, the collecting ducts of the kidneys become impermeable to water, leading to the inability
to concentrate urine and resulting in polyuria and polydipsia.
4. A 30-year-old female undergoes laboratory evaluation for infertility and irregular
menses. Results indicate elevated prolactin levels. Which of the following hypothalamic
factors exerts the primary inhibitory control over the secretion of this hormone?
A. Somatostatin
B. Thyrotropin-releasing hormone
C. Dopamine
D. Gonadotropin-releasing hormone
Rationale: Prolactin secretion is uniquely tonically inhibited by dopamine (prolactin-inhibiting
hormone) released from the hypothalamus. A reduction in dopamine tone or stalk
compression leads to hyperprolactinemia, which suppresses GnRH and causes hypogonadism.
5. Which of the following formed elements of the blood is correctly matched with its
primary physiological function?
A. Neutrophils: Production of antibodies during humoral immune responses
B. Erythrocytes: Transport of oxygen and carbon dioxide via hemoglobin
C. Platelets: Phagocytosis of cellular debris and antigen presentation
D. Basophils: Direct cytotoxicity against viral-infected host cells
Rationale: Erythrocytes (red blood cells) are specialized containers for hemoglobin, which
efficiently binds and transports oxygen from the lungs to tissues and assists in carbon dioxide
transport. Neutrophils are phagocytic, platelets are involved in hemostasis, and basophils
release histamine in allergic responses.
, 6. A patient is diagnosed with iron-deficiency anemia following routine blood work showing
microcytic, hypochromic red blood cells. Which laboratory parameter is expected to be
elevated in this condition?
A. Serum ferritin
B. Total iron-binding capacity (TIBC)
C. Serum iron
D. Transferrin saturation
Rationale: In iron-deficiency anemia, body iron stores are depleted, leading to a compensatory
liver increase in the synthesis of transferrin to capture any available iron. Therefore, total
iron-binding capacity (TIBC) increases, while serum iron, ferritin, and transferrin saturation
decrease.
7. An individual with type A blood receives a transfusion of type AB packed red blood cells.
Which of the following immunologic events is most likely to occur?
A. No adverse reaction because type A blood lacks antibodies against type AB antigens
B. Agglutination of the transfused red blood cells by the recipient's pre-formed anti-B antibodies
C. Immediate hemolysis mediated entirely by cell-mediated T-lymphocyte cytotoxicity
D. Sensitization without immediate reaction followed by delayed hypersensitivity
Rationale: Type A individuals possess natural anti-B antibodies in their plasma. When
transfused with type AB blood, the donor red blood cells carry B antigens, which react with
the recipient's anti-B antibodies, causing acute antibody-mediated agglutination and
hemolysis.
8. During hemostasis, which of the following clotting factors is responsible for cross-linking
fibrin polymers to form a stable, insoluble hemostatic plug?
A. Factor I (Fibrinogen)
B. Factor III (Tissue Factor)
C. Factor VIII (Antihemophilic factor)
D. Factor XIII (Fibrin-stabilizing factor)
Rationale: Factor XIIIa, activated by thrombin in the presence of calcium, is a
transglutaminase that catalyzes the formation of covalent bonds between fibrin strands,
transforming loose fibrin monomers into a dense, cross-linked, mechanically stable clot.
