B. Chromosomal abnormality
The right answer is Electrocardiography (or Electrocardiogram).
In a typical plot, one can notice five characteristic waves. They are called P, Q, R, S and T. The illustration below shows what a normal electrocardiogram looks like:
* the P wave marks the depolarization during the contraction of the atria;
* the PR interval indicates the time required to transmit the electrical impulse of the sinus node of the atria to the ventricular muscles;
* the QRS complex marks depolarization and ventricular contraction;
* the QT interval corresponds to the global ventricular repolarization;
* T wave refers to the end of ventricular repolarization.
Answer:
well i think you should be a good friend but at the same time try to suggest better ways to get energy and tell her the bad things about vitamin supplements like vitamin supplements can damage your liver or can reduce the effectiveness of blood thinner or can increase the risk of lung cancer in smokers.
Explanation:
hope this helps you have a great day
Vaccinations were first used in the year 1796.
