I don't Actually Know Anything :/

[the-confused-scientist]

Sinoatrial Node -> Atrioventricular Node

ECB is an acronym for...

E - Wave of Excitation (heartbeat)

C - Walls of atria (left and right) Contract

B - Blood flows to left + right ventricles.

:)

[the-confused-scientist]

Brine is salt yum

[the-confused-scientist]

so mcuh sciene eeh

[the-confused-scientist]

Alcehmy

[the-confused-scientist]

Lady Gaga discovered Uranium

[the-confused-scientist]

metal + non-metal = ionic bond