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 heart model, a large vein is observed running along the anterior surface of the heart in
the anterior interventricular sulcus. This vessel is the:
A. Great Cardiac Vein [CORRECT]
B. Middle Cardiac Vein
C. Anterior Interventricular Artery
D. Coronary Sinus
Correct Answer: A
Rationale: Correct because the Great Cardiac Vein accompanies the Left Anterior
Descending (LAD) artery in the anterior interventricular sulcus, draining blood from the
anterior heart wall.
Q2. On a histology slide of an artery, which tunica is composed primarily of circularly arranged
sheets of smooth muscle and is the thickest layer in muscular arteries?
A. Tunica Intima
B. Tunica Media [CORRECT]
C. Tunica Externa
D. Tunica Adventitia
Correct Answer: B
Rationale: Correct because the tunica media is the middle layer of blood vessels and is
responsible for vasoconstriction and vasodilation; it is the thickest layer in muscular
arteries.
, Q3. Using the ECG strip provided, calculate the heart rate if the distance between two R waves is
25 small boxes.
A. 60 bpm
B. 75 bpm
C. 60 bpm (Method: 300/25 = 12... wait, rule of 300. 300/5 = 60. If 25 small boxes = 5 large
boxes. 300/5 = 60 bpm).
D. 75 bpm
A. 60 bpm
B. 75 bpm
C. 100 bpm
D. 120 bpm
Correct Answer: A
Rationale: Correct because to calculate heart rate on an ECG, divide 1500 by the number
of small boxes between R waves ( = 60 bpm). Alternatively, 300 divided by the
number of large boxes (5) also equals 60 bpm.
Q4. A patient with Type B blood needs a transfusion. Which of the following donor blood types
is compatible?
A. Type A
B. Type AB
C. Type O [CORRECT]
D. Type A+
Correct Answer: C
Rationale: Correct because Type O blood lacks A and B antigens, making it compatible
with a Type B recipient who has anti-A antibodies. Type A and AB both carry the A antigen
which would cause a reaction.
with Lab Latest update 2026/2027 | Chamberlain |
Q&A with Rationales | Grade A | Pass Guaranteed
A+ Graded
Q1. On the heart model, a large vein is observed running along the anterior surface of the heart in
the anterior interventricular sulcus. This vessel is the:
A. Great Cardiac Vein [CORRECT]
B. Middle Cardiac Vein
C. Anterior Interventricular Artery
D. Coronary Sinus
Correct Answer: A
Rationale: Correct because the Great Cardiac Vein accompanies the Left Anterior
Descending (LAD) artery in the anterior interventricular sulcus, draining blood from the
anterior heart wall.
Q2. On a histology slide of an artery, which tunica is composed primarily of circularly arranged
sheets of smooth muscle and is the thickest layer in muscular arteries?
A. Tunica Intima
B. Tunica Media [CORRECT]
C. Tunica Externa
D. Tunica Adventitia
Correct Answer: B
Rationale: Correct because the tunica media is the middle layer of blood vessels and is
responsible for vasoconstriction and vasodilation; it is the thickest layer in muscular
arteries.
, Q3. Using the ECG strip provided, calculate the heart rate if the distance between two R waves is
25 small boxes.
A. 60 bpm
B. 75 bpm
C. 60 bpm (Method: 300/25 = 12... wait, rule of 300. 300/5 = 60. If 25 small boxes = 5 large
boxes. 300/5 = 60 bpm).
D. 75 bpm
A. 60 bpm
B. 75 bpm
C. 100 bpm
D. 120 bpm
Correct Answer: A
Rationale: Correct because to calculate heart rate on an ECG, divide 1500 by the number
of small boxes between R waves ( = 60 bpm). Alternatively, 300 divided by the
number of large boxes (5) also equals 60 bpm.
Q4. A patient with Type B blood needs a transfusion. Which of the following donor blood types
is compatible?
A. Type A
B. Type AB
C. Type O [CORRECT]
D. Type A+
Correct Answer: C
Rationale: Correct because Type O blood lacks A and B antigens, making it compatible
with a Type B recipient who has anti-A antibodies. Type A and AB both carry the A antigen
which would cause a reaction.
