Lab Practicum BIOS 255 Anatomy & Physiology III
with Lab Latest update 2026/2027 | Chamberlain |
Q&A with Rationales | Grade A | Pass Guaranteed
A+ Graded
Q1: On the anatomical heart model provided at your station, identify the valve located between
the left atrium and left ventricle.
A. Tricuspid valve
B. Pulmonary semilunar valve
C. Mitral (Bicuspid) valve [CORRECT]
D. Aortic semilunar valve
Correct Answer: C
Rationale: Correct because the left atrioventricular valve has two cusps (bicuspid),
distinguishing it from the tricuspid valve on the right side. In lab, we observed the
"bishop's mitre" shape of this valve during dissection.
Q2: Examine the blood smear slide under the microscope (40x objective). Identify the white
blood cell indicated by the pointer that has a multi-lobed nucleus (3-5 lobes) and fine pink/lilac
granules.
A. Lymphocyte
B. Monocyte
C. Eosinophil
D. Neutrophil [CORRECT]
Correct Answer: D
Rationale: Correct because neutrophils are characterized by their polymorphonuclear
(multi-lobed) appearance and neutral-staining granules. This distinguishes them from
lymphocytes (large round nucleus) and monocytes (kidney-bean nucleus).
, Q3: You are performing a blood typing lab. A patient's sample shows agglutination (clumping) in
the well labeled "Anti-A" and the well labeled "Anti-Rh", but remains smooth in the "Anti-B"
well. What is the patient's blood type?
A. A-
B. A+ [CORRECT]
C. B+
D. AB+
Correct Answer: B
Rationale: Correct because agglutination with Anti-A indicates the presence of A antigens,
and agglutination with Anti-Rh indicates the Rh factor is present. No reaction with Anti-B
confirms the absence of B antigens, resulting in Type A positive.
Q4: Look at the ECG tracing on the monitor. The distance from the start of the P wave to the
start of the QRS complex is measured at 0.24 seconds (normal is 0.12-0.20s). What does this
finding indicate?
A. Ventricular fibrillation
B. First-degree AV block [CORRECT]
C. Atrial flutter
D. Bundle branch block
Correct Answer: B
Rationale: Correct because this interval represents the PR interval. A prolonged PR
interval indicates delayed conduction through the AV node, which is the definition of a
first-degree heart block. The impulse is still reaching the ventricles, just slower than
normal.
Q5: In the histology slide of an artery and vein (cross-section), identify the structure of the artery
based on its distinct features.
A. Thin wall, large lumen, valves present
B. Thick tunica media, small lumen, no valves [CORRECT]
C. Thin tunica externa, irregular shape
D. Endothelium only, no smooth muscle
Correct Answer: B
Rationale: Correct because arteries must withstand high pressure, so they have a thick
tunica media (smooth muscle) and a relatively small, round lumen. Veins have thinner walls
and larger lumens.
with Lab Latest update 2026/2027 | Chamberlain |
Q&A with Rationales | Grade A | Pass Guaranteed
A+ Graded
Q1: On the anatomical heart model provided at your station, identify the valve located between
the left atrium and left ventricle.
A. Tricuspid valve
B. Pulmonary semilunar valve
C. Mitral (Bicuspid) valve [CORRECT]
D. Aortic semilunar valve
Correct Answer: C
Rationale: Correct because the left atrioventricular valve has two cusps (bicuspid),
distinguishing it from the tricuspid valve on the right side. In lab, we observed the
"bishop's mitre" shape of this valve during dissection.
Q2: Examine the blood smear slide under the microscope (40x objective). Identify the white
blood cell indicated by the pointer that has a multi-lobed nucleus (3-5 lobes) and fine pink/lilac
granules.
A. Lymphocyte
B. Monocyte
C. Eosinophil
D. Neutrophil [CORRECT]
Correct Answer: D
Rationale: Correct because neutrophils are characterized by their polymorphonuclear
(multi-lobed) appearance and neutral-staining granules. This distinguishes them from
lymphocytes (large round nucleus) and monocytes (kidney-bean nucleus).
, Q3: You are performing a blood typing lab. A patient's sample shows agglutination (clumping) in
the well labeled "Anti-A" and the well labeled "Anti-Rh", but remains smooth in the "Anti-B"
well. What is the patient's blood type?
A. A-
B. A+ [CORRECT]
C. B+
D. AB+
Correct Answer: B
Rationale: Correct because agglutination with Anti-A indicates the presence of A antigens,
and agglutination with Anti-Rh indicates the Rh factor is present. No reaction with Anti-B
confirms the absence of B antigens, resulting in Type A positive.
Q4: Look at the ECG tracing on the monitor. The distance from the start of the P wave to the
start of the QRS complex is measured at 0.24 seconds (normal is 0.12-0.20s). What does this
finding indicate?
A. Ventricular fibrillation
B. First-degree AV block [CORRECT]
C. Atrial flutter
D. Bundle branch block
Correct Answer: B
Rationale: Correct because this interval represents the PR interval. A prolonged PR
interval indicates delayed conduction through the AV node, which is the definition of a
first-degree heart block. The impulse is still reaching the ventricles, just slower than
normal.
Q5: In the histology slide of an artery and vein (cross-section), identify the structure of the artery
based on its distinct features.
A. Thin wall, large lumen, valves present
B. Thick tunica media, small lumen, no valves [CORRECT]
C. Thin tunica externa, irregular shape
D. Endothelium only, no smooth muscle
Correct Answer: B
Rationale: Correct because arteries must withstand high pressure, so they have a thick
tunica media (smooth muscle) and a relatively small, round lumen. Veins have thinner walls
and larger lumens.
