Question
Draw a standard ECG and explain the different segments in it.
✓
Answer
The P-wave represents the electrical excitation (or depolarisation) of the atria, which leads to the contraction of both the atria. The QRS complex represents the depolarisation of the ventricles, which initiates the ventricular contraction. The contraction starts shortly after Q and marks the beginning of the systole.
The T-wave represents the return of the ventricles from excited to the normal state (repolarization). The end of the T-wave marks the end of systole.
Obviously, by counting the number of QRS complexes that occur in a given time period, one can determine the heartbeat rate of an individual. Since the ECGs obtained from different individuals have roughly the same shape for a given lead configuration, any deviation from this shape indicates a possible abnormality or disease. Hence, it is of great clinical significance.
The T-wave represents the return of the ventricles from excited to the normal state (repolarization). The end of the T-wave marks the end of systole.
Obviously, by counting the number of QRS complexes that occur in a given time period, one can determine the heartbeat rate of an individual. Since the ECGs obtained from different individuals have roughly the same shape for a given lead configuration, any deviation from this shape indicates a possible abnormality or disease. Hence, it is of great clinical significance.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Distinguish between the following:
Stele and vascular bundle.
Stele and vascular bundle.
List out the functions of a museum.
Neha while learning for her test, got confused how aerobic pyruvic acid is transported to mitochondria for further oxidation. She asked her elder sister (who is a graduate in biology) about this and also asked her to explain the same process in detail. Her sister explained her that it gets completely oxidised into CO2 and water along with the formation of ATP.
- Mention the sites in the mitochondria, where these events occur.
- What happens to pyruvic acid before it enters 'Krebs' cycle?
- Write the summary equation for the 'Krebs' cycle.
- Mention the value implicit through Neha's character.
Give a brief description of nucleic acid.
What is the heartbeat? Write four differences between Neurogenic Heart and Myogenic Heart.
What is the natural source of auxin? Write any four differences between auxin and gibberellin.
Name any three disorders related to bones/ skeletal system and describe them.
Classify the following:
plants into Long-Day Plants (LDP), Short Day Plants (SDP) and Day Neutral Plants (DNP) Xanthium, Henbane (Hyoscyamus niger), Spinach, Rice, Strawberry, Bryophyllum, Sunflower, Tomato, Maize.
plants into Long-Day Plants (LDP), Short Day Plants (SDP) and Day Neutral Plants (DNP) Xanthium, Henbane (Hyoscyamus niger), Spinach, Rice, Strawberry, Bryophyllum, Sunflower, Tomato, Maize.
Both gymnosperms and angiosperms bear seeds, then why are they classified separately?
Nucleic acids exhibit secondary structure, justify with example.