Human Physiology Multiple Choice Questions on “Body Fluid and Circulation – Heart Sounds”.
1. Heart beat initiates from ________
A. Purkinji fibers
B. SA node
C. Bundle of HIS
D. Auriculo ventricular node
Answer: b
Clarification: The SA node is heart’s natural pacemaker. Heart beat initiates from SA node.
2. An artificial pace maker is implanted and connected to the heart in patients ___________
A. suffering from arteriosclerosis
B. having high blood pressure
C. with irregularity in heart rhythm
D. having 90% blockage
Answer: C
Clarification: A pace maker is a medical device which uses electrical impulses, delivered by the electrodes contacting the heart muscles to regulate the beating of the heart.
3. A heat murmurs indicates a defective ___________
A. Heart valves
B. Bundle of HIS
C. SA node
D. AV node
View Answer
Answer: A
Clarification: A heart murmur can be a symptom of serious heart diseases. A heart murmur indicates defective heart valve.
4. Choose the correct pathway of the transmission of impulses in heart beat.
A. AV node- SA node- Bundle of HIS- Purkinji fibres
B. SA node- AV node- Bundle of HIS- Purkinji fibres
C. SA node- Bundle of HIS- AV node- Purkinji fibres
D. SA node Purkinji fibres- Bundle of HIS- AV node
View Answer
Answer: B
Clarification: The heart impulse starts from SA node and ends in Purkinji fibres.
5. In ECG the depolarization of atria is indicated by __________
A. P wave
B. Q wave
C. R wave
D. S wave
View Answer
Answer: A
Clarification: In ECG the depolarization of atria is indicated by P wave. This happens right before the atria contracts and push blood into the ventricles.
6. Which of the following pair is correctly matched?
A. Dup- Sudden opening of semilunar valves at the beginning of ventricle diastole
B. Lubb- Sharp closing of AV valves at the beginning of ventricular systole
C. Pulsation of radial artery valves in blood vessels
D. Initiation of heart beat- Purkinji fibers
Answer: B
Clarification: The lub is the first heart sound and is caused by the closure of mitral valve and tricuspid valves at the startup systole. The second sound dub is caused by the closer of aortic and pulmonic valve marking the end of systole.
7. Which instrument is used to listen to the internal sounds of the human body?
A. Stethoscope
B. Sphygmomanometer
C. Reflex hammer
D. Suction device
Answer: A
Clarification: Stethoscope is an acoustic medical device for auscultation. It has a small disc shaped resonator that is placed against the chest and two tubes connected to earpieces.