Kundin nasa, wanda kuma aka sani da damshin atrioventricular, wani ƙwanƙwasa ce ta filayen tsoka na zuciya wanda ke tafiya tare da tsakar tsakar zuciya na zuciya. Yana daga cikin tsarin sarrafa wutar lantarki na zuciya kuma yana da alhakin daidaita ƙanƙarar ventricles, wanda ke da mahimmanci don kiyaye aikin zuciya daidai.
