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 — Medische flashcarddecks

Naar de inhoud

.launch-header{position:relative!important}.launch-desktop-nav button,.launch-mobile-toggle,.experience-region-trigger{display:none!important}.experience-noscript-nav{display:flex;flex-wrap:wrap;justify-content:center;gap:16px;padding:16px;background:#f8fafc;font-size:13px}.experience-noscript-nav a{min-height:44px;display:inline-flex;align-items:center}Prognia Ward Suture Osler Medische bibliotheek Prijzen English Nederlands Español Français Deutsch