wiz-icon
MyQuestionIcon
MyQuestionIcon
9
You visited us 9 times! Enjoying our articles? Unlock Full Access!
Question

Assertion: SA node induces excitatory impulses in the heart.
Reason: S.A. node is self-excitatory.

A
Both assertion and reason, are true and the reason is the correct explanation of assertion.
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
Both assertion and reason, are true but the reason is not the correct explanation of the assertion.
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
The assertion is true but the reason is false
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Both assertion and reason are false.
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is A Both assertion and reason, are true and the reason is the correct explanation of assertion.
Sinu-auricular node or S-A node is located in the wall of the right auricle below the opening of superior vena cava. The S-A node has a unique property of self-excitation, which enables it to act as "pacemaker" of the heart. It spontaneously initiates a wave of contraction which spreads over both the auricles more or less simultaneously along the muscle fibres that fan out from the pacemaker.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Conducting System of the Heart
BIOLOGY
Watch in App
Join BYJU'S Learning Program
CrossIcon