None
None
None
replace
replace
Your heart has a slide running through it because you want to be certain that the blood is flowing in and out of it smoothly. Given how important this is, you want to be absolutely certain.
ひつ
かなら
None
To be certain that the heart-slide is working, the doctor who put it there hits (ひつ) you in the chest a few times as a test.
An update is needed before you can continue but you have more than one WaniKani tab open.
Finish up whatever you are doing on the other tab(s), then close them to continue.
The update will complete automatically once the other tab(s) are closed.