Which of following is/are the impulse generating tissue/s in heart?
a) SA node
b) purkinji fibers
c) AV node
d) all of these
Explanation: it is located in the upper dorsal wall of the right atrium of heart near the entrance of the superior vena cava
The pacemaker or SA node (sino-atrial node) is located in the upper dorsal wall of the ……..
a) right atrium
b) left atrium
c) right ventricle
d) left ventricle
Which of the following is/are the function of AV node?
a) generates electrical impulse
b) co-ordinates heart rate
c) plays role in continuous working of heart
d) all of these
Explanation: AV (atrio-ventricular) node connects atrial and ventriclular chambers 
Which of the
following slow/s down the speed of the electrical signals to delay the
contraction of ventricles until the atria not fully contracted?
a) SA node
b) Purkinji fibers
c) AV node
d) all of these
Which of the following extend in the form of a branching tree in the heat and play/s an important role in its continuous working?
a) SA node
b) Purkinji fibers
c) AV node
d) all of these
Explanation: these were discovered by Evangelista Purkyne in 1839
Purkinj fibers are the extension of which of the following system?
a) heart muscle
b) somatic nervous system
c) blood vessels
d) autonomic nervous system
