Lub Dub | S1 S2

Lub and Dub knew they had to work together to defeat Atheros and restore the kingdom's cardiovascular health. Lub started singing his lullabies louder and more frequently, encouraging the heart cells to relax and stay healthy. Dub, meanwhile, pumped harder and more efficiently, pushing blood through the vessels and dislodging Atheros' pesky plaque.

Palpate the carotid pulse while listening. S1 occurs just before the pulse; S2 occurs just after. s1 s2 lub dub