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NWCA CET EXAM LATEST UPDATE THIS YEAR
(2026-2027) ALL 300 QUESTIONS AND CORRECT
ANSWERS WITH RATIONALES
1. Which structure initiates the electrical impulse that sets the normal heart rate?
A) Atrioventricular (AV) node
B) Purkinje fibers
C) Sinoatrial (SA) node
D) Bundle of His
Answer: C
The SA node, located in the right atrium, is the primary pacemaker of the heart and generates
impulses at 60–100 beats per minute.
2. Which valves open to allow the ventricles to fill with blood?
A) Aortic and pulmonic valves
B) Tricuspid and mitral valves
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C) Aortic and mitral valves
D) Pulmonic and tricuspid valves
Answer: B
The tricuspid (right) and mitral (left) valves open during diastole to allow blood to flow from the
atria into the ventricles. The semilunar valves (aortic and pulmonic) open during systole.
3. The layer of the heart that is damaged during a heart attack is the:
A) Endocardium
B) Myocardium
C) Epicardium
D) Pericardium
Answer: B
The myocardium is the muscular layer of the heart responsible for contraction. During a
myocardial infarction (heart attack), this layer is damaged due to ischemia.
4. In which cardiac chamber is the myocardium thickest?
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A) Right atrium
B) Left atrium
C) Right ventricle
D) Left ventricle
Answer: D
The left ventricle pumps blood to the systemic circulation against high resistance and therefore
has the thickest muscular wall.
5. Which chamber of the heart receives oxygen-rich blood from the pulmonary veins?
A) Right atrium
B) Left atrium
C) Right ventricle
D) Left ventricle
Answer: B
The pulmonary veins carry oxygenated blood from the lungs to the left atrium. The left atrium
then pumps this blood into the left ventricle.
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6. Which cardiac chamber receives deoxygenated blood from the systemic circulation?
A) Right atrium
B) Left atrium
C) Right ventricle
D) Left ventricle
Answer: A
The right atrium receives deoxygenated blood from the body via the superior and inferior vena
cava. This blood then passes to the right ventricle to be pumped to the lungs.
7. The inferior vena cava returns blood to the heart from which part of the body?
A) Upper part of the body
B) Lower part of the body
C) The lungs
D) The brain
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NWCA CET EXAM LATEST UPDATE THIS YEAR
(2026-2027) ALL 300 QUESTIONS AND CORRECT
ANSWERS WITH RATIONALES
1. Which structure initiates the electrical impulse that sets the normal heart rate?
A) Atrioventricular (AV) node
B) Purkinje fibers
C) Sinoatrial (SA) node
D) Bundle of His
Answer: C
The SA node, located in the right atrium, is the primary pacemaker of the heart and generates
impulses at 60–100 beats per minute.
2. Which valves open to allow the ventricles to fill with blood?
A) Aortic and pulmonic valves
B) Tricuspid and mitral valves
1
, Page 2 of 176
C) Aortic and mitral valves
D) Pulmonic and tricuspid valves
Answer: B
The tricuspid (right) and mitral (left) valves open during diastole to allow blood to flow from the
atria into the ventricles. The semilunar valves (aortic and pulmonic) open during systole.
3. The layer of the heart that is damaged during a heart attack is the:
A) Endocardium
B) Myocardium
C) Epicardium
D) Pericardium
Answer: B
The myocardium is the muscular layer of the heart responsible for contraction. During a
myocardial infarction (heart attack), this layer is damaged due to ischemia.
4. In which cardiac chamber is the myocardium thickest?
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A) Right atrium
B) Left atrium
C) Right ventricle
D) Left ventricle
Answer: D
The left ventricle pumps blood to the systemic circulation against high resistance and therefore
has the thickest muscular wall.
5. Which chamber of the heart receives oxygen-rich blood from the pulmonary veins?
A) Right atrium
B) Left atrium
C) Right ventricle
D) Left ventricle
Answer: B
The pulmonary veins carry oxygenated blood from the lungs to the left atrium. The left atrium
then pumps this blood into the left ventricle.
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6. Which cardiac chamber receives deoxygenated blood from the systemic circulation?
A) Right atrium
B) Left atrium
C) Right ventricle
D) Left ventricle
Answer: A
The right atrium receives deoxygenated blood from the body via the superior and inferior vena
cava. This blood then passes to the right ventricle to be pumped to the lungs.
7. The inferior vena cava returns blood to the heart from which part of the body?
A) Upper part of the body
B) Lower part of the body
C) The lungs
D) The brain
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