This set of Human Physiology Multiple Choice Questions & Answers (MCQs) focuses on “Body Fluid and Circulation – Human Heart”.
1. “Heart of heart” is ________
a) SA node
b) AV node
c) Bundle of HIS
d) Purkinji fibers
View Answer
Explanation: “Heart of heart” is SA node.
2. Which of the following has the thickest wall?
a) Right ventricle
b) Left ventricle
c) Right atrium
d) Left atrium
View Answer
Explanation: Left ventricle has the thickest wall in the human heart.
3. Pacemaker is __________
a) AV node
b) SA node
c) Bundle of HIS
d) Ventricle muscles
View Answer
Explanation: Pacemaker is SA node. SA node is located in upper lateral wall of right atrium.
4. SA node is located in _____
a) upper lateral wall of right atrium
b) lower lateral wall of left atrium
c) lower lateral wall of right atrium
d) upper lateral wall of left atrium
View Answer
Explanation: SA node is located in upper lateral wall of right atrium.
5. “Bundle of HIS” is made up of _________
a) nervous tissue supplied to ventricles
b) nervous tissue supplied to heart
c) muscular tissue supplied to heart
d) muscular tissue supplied to ventricles
View Answer
Explanation: Bundle of HIS is made up of muscular tissue supplied to ventricles.
6. Blood enters into the heart because of muscles of _______
a) atria relax
b) ventricles contract
c) ventricles relax
d) atria contract
View Answer
Explanation: Blood enters the heart through large veins called as vena cava. Blood enters the heart when the muscles of atria relax and it is pumped out when it is contracted.
7. The opening of right atrium into right ventricle is guarded by _______
a) mitral valve
b) tricuspid valve
c) bicuspid valve
d) aortic semilunar valve
View Answer
Explanation: The tricuspid valve is on the right dorsal side of the mammalian heart between the right atrium and right ventricle. The function of the valve is to prevent back flow of blood into right atrium.
8. Mitral valve is present between __________
a) right atrium and left ventricle
b) right and left ventricle
c) left ventricle and aorta
d) left atrium and left ventricle
View Answer
Explanation: Mitral valve is a valve that lets blood flow from one chamber of the heart, the left atrium to another called the left ventricle. In mitral valve prolapsed part of mitral valve slips backward loosely into the chamber called the left atrium.
Sanfoundry Global Education & Learning Series – Human Anatomy and Physiology.
To practice all areas of Human Anatomy and Physiology, here is complete set of 1000+ Multiple Choice Questions and Answers.
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