This card explains the myogenic nature of cardiac muscle and how the heartbeat is controlled by the sinoatrial node (SAN), atrioventricular node (AVN), and the bundle of His, ensuring efficient ventricular contraction.
Tato karta vysvětluje myogenní povahu srdečního svalu a řízení srdečního rytmu sinoatriálním uzlem (SAN), atrioventrikulárním uzlem (AVN) a Hissovým svazkem, zajišťujícím efektivní kontrakci komor.
| Front | Cardiac muscle myogenic 3.1.2(g) |
|---|---|
| Back | - myogenic (has own instrinsic rhythm), rhythm maintained by wave of electrical excitation (Luke nerve impulse) - sino arterial node (SAN) in pacemaker area causes atria to contract (initiate heartbeat), insulator prevents excitation passing to vesicle - electrical activity from SAN picked up by AVN, which delays before stimulating bundle of His (bundle of conducting tissue made up of purkyne fibres), BOH split into 2 branches and conducts excitation to apex of heart - purkyne fibres spread through walls of ventricles (triggering contraction), by starting at apex, ventricles emptied efficiently - whole system makes sure atria stops contracting before ventricles start |
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