Which conduction tissue has a conduction velocity of 1 m/s?

Which conduction tissue has a conduction velocity of 1 m/s?

• A. SA node
• B. AV node
• C. Purkinje fibers
• D. Bundle of His

Answer: (A)

Conduction velocity varies across the heart’s conducting tissues to shape the timing of heartbeats. The Purkinje fibers conduct the fastest, enabling rapid ventricular activation. The bundle of His lies between the AV node and the Purkinje system and conducts at about 1 m/s, placing it in the range around 1 m/s. The AV node is deliberately slow to create a delay that allows adequate ventricular filling, with a much slower velocity. The SA node, while the natural pacemaker, is not a fast conduit for transmission. So, a velocity around 1 m/s best fits the bundle of His, which serves as the main fast-conduction pathway from the AV node to the ventricles.

Conduction velocity varies across the heart’s conducting tissues to shape the timing of heartbeats. The Purkinje fibers conduct the fastest, enabling rapid ventricular activation. The bundle of His lies between the AV node and the Purkinje system and conducts at about 1 m/s, placing it in the range around 1 m/s. The AV node is deliberately slow to create a delay that allows adequate ventricular filling, with a much slower velocity. The SA node, while the natural pacemaker, is not a fast conduit for transmission. So, a velocity around 1 m/s best fits the bundle of His, which serves as the main fast-conduction pathway from the AV node to the ventricles.