BIOD 331 AND NURS 231
PATHOPHYSIOLOGY FINAL 150
DETAILED CORRECT ANSWERS
WITH RATIONALES GRADE A+
VERIFIED | INSTANT DOWNLOAD
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1. A 68-year-old male patient presents to the emergency
department with sudden onset of severe chest pain radiating to
the left arm, diaphoresis, and shortness of breath. An ECG
reveals ST-segment elevation in leads II, III, and aVF. Based on
these clinical manifestations and diagnostic findings, The
correct answer is Acute Inferior Wall Myocardial
Infarction caused by occlusion of the Right Coronary
Artery because the inferior wall of the heart is supplied by the
right coronary artery in most individuals, and ST elevation in
these specific leads indicates transmural ischemia in that
territory, distinguishing it from anterior or lateral wall
infarctions which would present with changes in precordial or
lateral leads respectively.
2. A nurse is reviewing the laboratory results of a patient
diagnosed with Syndrome of Inappropriate Antidiuretic
Hormone (SIADH). Which set of lab values would the nurse
expect to find that confirms this diagnosis? The correct
answer is Serum Sodium 128 mEq/L and Urine
Osmolality greater than Serum Osmolality because
SIADH is characterized by excessive retention of free water
leading to dilutional hyponatremia, while the inappropriate
,secretion of ADH causes the kidneys to concentrate urine
despite low serum osmolality, resulting in urine that is
inappropriately concentrated relative to the hypotonic
plasma.
3. During a lecture on cellular injury, a nursing student asks
about the primary mechanism of cell death in ischemic tissue
versus toxic exposure. The instructor explains that The
correct answer is Ischemia typically causes
necrosis due to ATP depletion and membrane pump
failure, whereas toxic exposure often triggers
apoptosis through mitochondrial cytochrome c release
because ischemic injury leads to loss of oxidative
phosphorylation, sodium-potassium pump failure, cellular
swelling, and eventual membrane rupture (necrosis), while
many toxins activate intrinsic caspase pathways that result in
controlled, programmed cell dismantling without significant
inflammation.
4. A 45-year-old female with a history of Hashimoto’s
thyroiditis presents with fatigue, weight gain, cold intolerance,
and constipation. Laboratory tests show elevated TSH and
decreased Free T4. The pathophysiological basis for her
symptoms is best described as: The correct answer is
Primary Hypothyroidism resulting from autoimmune
destruction of thyroid follicles leading to decreased
metabolic rate and reduced sympathetic activity
because Hashimoto’s involves anti-thyroid peroxidase
antibodies that destroy thyroid tissue, reducing hormone
production; the lack of T3/T4 slows basal metabolism,
decreases thermogenesis causing cold intolerance, and reduces
gastrointestinal motility leading to constipation, while the
pituitary responds to low T4 by increasing TSH secretion.
5. In the context of chronic obstructive pulmonary disease
(COPD), a patient exhibits a barrel-shaped chest, pursed-lip
,breathing, and a prolonged expiratory phase. These physical
findings are primarily attributed to: The correct answer
is Air trapping and hyperinflation caused by loss of
elastic recoil and premature airway closure during
expiration because emphysematous destruction of alveolar
septa reduces elastic tethering of small airways, causing them
to collapse during exhalation; this prevents complete
emptying of the lungs, leading to increased residual volume,
hyperinflation that flattens the diaphragm and expands the
anteroposterior diameter, and the need for pursed-lip
breathing to create positive end-expiratory pressure that
stents airways open.
6. A patient with type 2 diabetes mellitus has developed
microalbuminuria and a declining glomerular filtration rate
(GFR). The underlying pathophysiology of diabetic
nephropathy in this patient is best explained by: The
correct answer is Non-enzymatic glycosylation of
basement membranes and hemodynamic
hyperfiltration leading to glomerulosclerosis because
chronic hyperglycemia causes advanced glycation end-
products to accumulate in the glomerular basement
membrane, thickening it and increasing permeability, while
concurrent afferent arteriolar dilation increases
intraglomerular pressure, promoting mesangial expansion
and eventual scarring that manifests clinically as proteinuria
and progressive renal failure.
7. When teaching a patient newly diagnosed with myasthenia
gravis about their condition, the nurse should explain that
muscle weakness worsens with activity and improves with rest
because: The correct answer is Autoantibodies
against acetylcholine receptors reduce the number of
functional receptors at the neuromuscular junction,
and repetitive stimulation depletes available
, acetylcholine below the threshold needed for
depolarization because myasthenia gravis is an
autoimmune disorder where IgG antibodies block or destroy
postsynaptic ACh receptors; with repeated nerve impulses, the
normal physiological decline in ACh release combined with
reduced receptor density causes end-plate potentials to fall
below threshold, resulting in fatigable weakness that recovers
after rest allows ACh stores to replenish.
8. A 72-year-old male presents with confusion, polyuria, and
dehydration. Labs reveal serum calcium of 14.2 mg/dL and
suppressed PTH. The most likely etiology for this
hypercalcemia is: The correct answer is Malignancy-
associated hypercalcemia mediated by PTH-related
peptide (PTHrP) secretion or osteolytic metastases
because when hypercalcemia occurs with suppressed intact
PTH, primary hyperparathyroidism is ruled out; malignancy
is the most common cause of severe hypercalcemia in
hospitalized elderly patients, either through tumor secretion of
PTHrP which mimics PTH action on bone and kidney, or
direct bone destruction releasing calcium, both of which
suppress native PTH via negative feedback.
9. In discussing the pathophysiology of heart failure with
preserved ejection fraction (HFpEF), the nurse educator
emphasizes that unlike HFrEF, the primary problem in HFpEF
is: The correct answer is Diastolic dysfunction due
to ventricular stiffness and impaired relaxation rather
than systolic pumping failure because HFpEF patients
maintain normal LVEF (>50%) but have concentric
hypertrophy and fibrosis that make the left ventricle non-
compliant; this impairs filling during diastole, elevating left
atrial and pulmonary venous pressures leading to congestion,
whereas contractility remains relatively intact, distinguishing
it from HFrEF where eccentric remodeling and myocyte loss
reduce ejection fraction.
PATHOPHYSIOLOGY FINAL 150
DETAILED CORRECT ANSWERS
WITH RATIONALES GRADE A+
VERIFIED | INSTANT DOWNLOAD
| 100% PASS GUARANTEE
1. A 68-year-old male patient presents to the emergency
department with sudden onset of severe chest pain radiating to
the left arm, diaphoresis, and shortness of breath. An ECG
reveals ST-segment elevation in leads II, III, and aVF. Based on
these clinical manifestations and diagnostic findings, The
correct answer is Acute Inferior Wall Myocardial
Infarction caused by occlusion of the Right Coronary
Artery because the inferior wall of the heart is supplied by the
right coronary artery in most individuals, and ST elevation in
these specific leads indicates transmural ischemia in that
territory, distinguishing it from anterior or lateral wall
infarctions which would present with changes in precordial or
lateral leads respectively.
2. A nurse is reviewing the laboratory results of a patient
diagnosed with Syndrome of Inappropriate Antidiuretic
Hormone (SIADH). Which set of lab values would the nurse
expect to find that confirms this diagnosis? The correct
answer is Serum Sodium 128 mEq/L and Urine
Osmolality greater than Serum Osmolality because
SIADH is characterized by excessive retention of free water
leading to dilutional hyponatremia, while the inappropriate
,secretion of ADH causes the kidneys to concentrate urine
despite low serum osmolality, resulting in urine that is
inappropriately concentrated relative to the hypotonic
plasma.
3. During a lecture on cellular injury, a nursing student asks
about the primary mechanism of cell death in ischemic tissue
versus toxic exposure. The instructor explains that The
correct answer is Ischemia typically causes
necrosis due to ATP depletion and membrane pump
failure, whereas toxic exposure often triggers
apoptosis through mitochondrial cytochrome c release
because ischemic injury leads to loss of oxidative
phosphorylation, sodium-potassium pump failure, cellular
swelling, and eventual membrane rupture (necrosis), while
many toxins activate intrinsic caspase pathways that result in
controlled, programmed cell dismantling without significant
inflammation.
4. A 45-year-old female with a history of Hashimoto’s
thyroiditis presents with fatigue, weight gain, cold intolerance,
and constipation. Laboratory tests show elevated TSH and
decreased Free T4. The pathophysiological basis for her
symptoms is best described as: The correct answer is
Primary Hypothyroidism resulting from autoimmune
destruction of thyroid follicles leading to decreased
metabolic rate and reduced sympathetic activity
because Hashimoto’s involves anti-thyroid peroxidase
antibodies that destroy thyroid tissue, reducing hormone
production; the lack of T3/T4 slows basal metabolism,
decreases thermogenesis causing cold intolerance, and reduces
gastrointestinal motility leading to constipation, while the
pituitary responds to low T4 by increasing TSH secretion.
5. In the context of chronic obstructive pulmonary disease
(COPD), a patient exhibits a barrel-shaped chest, pursed-lip
,breathing, and a prolonged expiratory phase. These physical
findings are primarily attributed to: The correct answer
is Air trapping and hyperinflation caused by loss of
elastic recoil and premature airway closure during
expiration because emphysematous destruction of alveolar
septa reduces elastic tethering of small airways, causing them
to collapse during exhalation; this prevents complete
emptying of the lungs, leading to increased residual volume,
hyperinflation that flattens the diaphragm and expands the
anteroposterior diameter, and the need for pursed-lip
breathing to create positive end-expiratory pressure that
stents airways open.
6. A patient with type 2 diabetes mellitus has developed
microalbuminuria and a declining glomerular filtration rate
(GFR). The underlying pathophysiology of diabetic
nephropathy in this patient is best explained by: The
correct answer is Non-enzymatic glycosylation of
basement membranes and hemodynamic
hyperfiltration leading to glomerulosclerosis because
chronic hyperglycemia causes advanced glycation end-
products to accumulate in the glomerular basement
membrane, thickening it and increasing permeability, while
concurrent afferent arteriolar dilation increases
intraglomerular pressure, promoting mesangial expansion
and eventual scarring that manifests clinically as proteinuria
and progressive renal failure.
7. When teaching a patient newly diagnosed with myasthenia
gravis about their condition, the nurse should explain that
muscle weakness worsens with activity and improves with rest
because: The correct answer is Autoantibodies
against acetylcholine receptors reduce the number of
functional receptors at the neuromuscular junction,
and repetitive stimulation depletes available
, acetylcholine below the threshold needed for
depolarization because myasthenia gravis is an
autoimmune disorder where IgG antibodies block or destroy
postsynaptic ACh receptors; with repeated nerve impulses, the
normal physiological decline in ACh release combined with
reduced receptor density causes end-plate potentials to fall
below threshold, resulting in fatigable weakness that recovers
after rest allows ACh stores to replenish.
8. A 72-year-old male presents with confusion, polyuria, and
dehydration. Labs reveal serum calcium of 14.2 mg/dL and
suppressed PTH. The most likely etiology for this
hypercalcemia is: The correct answer is Malignancy-
associated hypercalcemia mediated by PTH-related
peptide (PTHrP) secretion or osteolytic metastases
because when hypercalcemia occurs with suppressed intact
PTH, primary hyperparathyroidism is ruled out; malignancy
is the most common cause of severe hypercalcemia in
hospitalized elderly patients, either through tumor secretion of
PTHrP which mimics PTH action on bone and kidney, or
direct bone destruction releasing calcium, both of which
suppress native PTH via negative feedback.
9. In discussing the pathophysiology of heart failure with
preserved ejection fraction (HFpEF), the nurse educator
emphasizes that unlike HFrEF, the primary problem in HFpEF
is: The correct answer is Diastolic dysfunction due
to ventricular stiffness and impaired relaxation rather
than systolic pumping failure because HFpEF patients
maintain normal LVEF (>50%) but have concentric
hypertrophy and fibrosis that make the left ventricle non-
compliant; this impairs filling during diastole, elevating left
atrial and pulmonary venous pressures leading to congestion,
whereas contractility remains relatively intact, distinguishing
it from HFrEF where eccentric remodeling and myocyte loss
reduce ejection fraction.
