Intranodal pathways - Study guides, Class notes & Summaries

sinus node - ANSWER The intrinsic pacemaker. Cell membrane "leakiness" causes spontaneous depolarization at a rate of 60-100 times a minute. AV node - ANSWER Acts like a resistor to slow the impulse allowing time for the atria to completely contract before initiating ventricular contraction. Back up pacemaker if SA fails, pacing at a rate of 40-60 times a minute. Bundle of his - ANSWER "Cable" that passes through the fibrous sheath separating atria from ventricles. Divides into the bun...

Telemetry Med Surg Exam 3 1. Sinus Node (SA Node): - The natural pacemaker of the heart. Its cell membrane properties cause it to spontaneously depolarize, generating impulses at a rate of 60-100 times per minute. 2. Atrioventricular Node (AV Node): - Acts as a resistor, slowing down the electrical impulse from the atria to allow for complete atrial contraction before initiating ventricular contraction. It serves as a backup pacemaker if the SA node fails, pacing at a rate of 40-60 tim...