NEET 2009
- Exam
- NEET
- Year
- 2009
- Subject
- Zoology
- Chapter
- Body Fluids and Circulation
NEET 2009 · Zoology · Body Fluids and Circulation
In a standard ECG, which one of the following alphabets is the...
In a standard ECG, which one of the following alphabets is the correct representation of the respective activity of the human heart?
Options
- AR-repolarisation of ventricles
- BS-start of systole
- CT-end of diastole
- DP-depolarisation of the atria
Correct answer
D. P-depolarisation of the atria
Step-by-step solution
In ECG, P-wave indicates impulse of contraction generated by SA-node and it spreads in atria causing atrial depolarisation.
T-wave is the most constant and conspicuous wave having the tallest amplitude. It is the first positive deflection during ventricular depolarisation.
S-wave is the next downward deflection constant but often inconspicuous.
T-wave is repolarisation wave of ventricular relaxation.