Whey is the liquid remaining after milk has been curdled and strained. It is a by-product of the manufacture of cheese or casein and has several commercial uses. Sweet whey is manufactured during the making of rennet types of hard cheese like cheddar or Swiss cheese.
The endocardium underlies the much more voluminous myocardium, the muscular tissue responsible for the contraction of the heart. The outer layer of the heart is termed epicardium and the heart is surrounded by a small amount of fluid enclosed by a fibrous sac called the pericardium. 1 Function.
Layers of the Heart. The wall of the heart has three layers: the outer epicardium ( epi - = on, upon; cardia = heart), the middle myocardium ( myo - = muscle), and the inner endocardium ( endo - = within, inward). The epicardium is the visceral layer of the pericardium .