Electrical conduction and wave indication

Question 1

Characteristics of SA node:

Answer 1

• pacemaker of the heart
• posses automaticity
• its intrinsic rate is 60-100 bpm

Question 2

P-wave is produced by:

Answer 2

the electrical impulse that originated from the SA node spread in a wavelike manner across the atrial muscle via the intranodal pathways and buchmann’s bundle, depolarizing the RA, interatrial septum, and LA

Question 3

Characteristics of AV node:

Answer 3

• gatekeeper of the heart
• impulse travels slowly through the AV node creating a DELAY = atrial kick
• intrinsic rate of 40-60 bpm

Question 4

PR segment is produced by:

Answer 4

impulse rapidly shoots from AV node to the bundle of HIS, bundle branches, and terminal purkinje fibers. The HIS-purkinje system is responsible for initiating ventricular contraction

Question 5

QRS complex is produced by and has an intrinsic rate of?

Answer 5

depolarization of the ventricles

20-40 bpm

Question 6

ST segment and T-wave are produced by:

Answer 6

repolarization of ventricles