In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart?

(A)S - start of systole
(B)T - end of diastole
(C)P - depolarisation of the atria
(D)R - repolarisation of ventricles

The NCERT line that answers it

Verbatim line

The P-wave represents the electrical excitation (or depolarisation) of the atria, which leads to the contraction of both the atria.

Chapter: Body Fluids and Circulation
Section: 15.3.3 Electrocardiogram (ECG)
Page: 8
Words matched: 20 of 20

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 'The P-wave represents the electrical excitation (or depolarisation) of the atria', which directly matches option C's claim that 'P - depolarisation of the atria'.

We did this for 1,565 questions.

Every one traced to the exact sentence in NCERT that answers it, including 90% of the 2026 paper. Sit a mock on the real NEET 2027 computer interface and every mark you drop comes back with its line attached.

Take the free 5-minute check More from this chapter

Question text is reproduced from the published NEET 2009 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.