The sac is called the pericardial sac. The snake's heart can move 1 to 1 1/2 inches because of this sac.
pericardium
The tissue forming a loosely fitting "sack" around the heart is known as the pericardium. The musculature of the heart itself, consisting of "cardiac" muscle fibers, is, in general, referred to as the myocardium.
s stands for a lot of stuff such as snake,sack,stable and etc.
Erna Sack's birth name is Weber, Erna.
The sack worn by mountain men around their necks was called "a bullet pouch."
Another word for the coarse sack is a "gunnysack" or "potato sack."
nut sack
possibles sack
I-sack
The sac surrounding the heart is called the pericardium. The pericardium has two layers with fluid between them, and it serves to protect and anchor the heart.
A burlap bag. A potato sack A gunny sack
The hacky sack was invented in China. Another name for hacky sacks are footbags.