'P' wave of ECG occurs before the:
onset of ventricular ejection
end of atrial contraction
begining of atrial contraction
none of the above
C.
begining of atrial contraction
Electrocardiography (ECG or EKG) is the process of recording the electrical activity of the heart over a period of time using electrodes placed over the skin.
Each peak in the ECG is identified with a letter from P to T that corresponds to a specific electrical activity of the heart.
P- wave represents the electrical excitation or depolarisation of the atria. It is the first upward deflection caused by the passage of the action current over the auricles. Its average duration is about 0.1 sec.
QRS complex represents depolarisation of ventricles.
T- wave represents return of the ventricles from excited to normal state.
Which of the following is the character of the bile juice?
It has trypsin
It has no enzyme
It has enterogasterone
It has tripophnomide
Which of the following layer of heart wall consists of cardiac muscles ?
Endocardium
Myocardium
Epicardium
All of these
Blood pressure increases and heart rate decreases in response to :
exercise
haemorrhage
exposure to high altitude
increased intracranial pressure
