Are you talking about the heart? If so, the heart pumps blood through your veins and gives your blood oxygen. I don't think there is a hearty muscle.
The word hearty is an adjective.
He had a hearty laugh. They had a hearty meal to start the celebration.
"Hearty" can function as an adjective.
In japan Oden is a hearty stew!
Hearty magazine was created in 2008.
My mother is feeling hale And hearty after her knee operation
'Hale & hearty' means healthy & enthusiastic or energetic
Hearty Notes was created on 1994-08-24.
A nice, hearty stew would serve me well today. The friar gave out a hearty laugh when the jester stumbled.
The word 'hearty' is a noun as a word for a companion or buddy; a word for a sailor; a word for a person.The noun form of the adjective 'hearty' is heartiness.
In some dialects, "hearty." hale, hail
The suffixes of "hearty" can include "-ly" (heartily), "-ness" (heartiness), and "-er" (heartier).