What anatomical structures provide the low-resistance pathways allowing the heart to behave as a functional syncytium?

Gap junctions (found within intercalated disks).

Why is the cardiac action potential (~250 ms) significantly longer than that of skeletal muscle (~1-3 ms)?

The presence of a prolonged plateau phase caused by Ca2+ ion influx.

In the 'fast response' action potential of Purkinje fibers, what ion movement characterizes Phase 0?

Rapid inward current of Na+ through fast Na+ channels.

Which specific ion channel is responsible for the plateau phase (Phase 2) in cardiac muscle?

L-type (long-lasting) Ca2+ channels.

Cardiovascular Physiology: Heart Anatomy and Vascular Dynamics — Mazos de tarjetas médicas

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