Electro Cardio Gram Theory Part 1

Question 1

What Is Depolarisation ?

Answer 1

Depolarisation means the electrical signal is moving across the cardio cells and will lead to muscle contraction

Question 2

What is repolarisation

Answer 2

Repolarisation means the electrical signal recharging to fire again

Question 3

What does the P Wave represent

Answer 3

The SA node lays high in the wall of the atrium and initiates ATRIAL DEPOLARISATION.

Question 4

What is the PR segment

Answer 4

After the P wave there is a return to the iso electric line (flatline). This results in the PR segment (flat line just before Q wave)

Question 5

What is the QRS complex

Answer 5

Represents electrical force generated by VENTRICULAR DEPOLARISATION

Question 6

What is the ST segment

Answer 6

Represents the period between the end of ventricular depolarisation and the start of repolarisation

The ST segment MUST return to the iso electric line

Question 7

What is the T wave

Answer 7

This is VENTRICULAR REPOLARISATION
They should be about an eighth of the height of the corresponding R wave