NEET 1994 · Class 11

Body Fluids and Circulation

The pacesetter in the heart is called

  1. (A)sino-atrial node (SAN)
  2. (B)atrio-ventricular node (AVN)
  3. (C)Purkinje fibres
  4. (D)papillary muscle

The NCERT line that answers it

Verbatim line

The SAN can generate the maximum number of action potentials, i.e., $70-75 \text{ min}^{-1}$ , and is responsible for initiating and maintaining the rhythmic contractile activity of the heart.

Chapter
Body Fluids and Circulation
Section
15.3.1 Human Circulatory System
Page
6
Words matched
6 of 6

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states that the SAN is 'responsible for initiating and maintaining the rhythmic contractile activity of the heart,' which directly identifies it as the pacesetter.

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Question text is reproduced from the published NEET 1994 paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.