Which of the following is the thickest layer of the heart, which is made up of muscle?

A) Epicardium
B) Myocardium
C) Endocardium
D) Pericardium
E) Pericardial cavity

Myocardium

The thick, muscular tissue that makes up the middle layer of the heart wall, responsible for pumping blood through the cardiovascular system.

Heart Layer

The anatomical layers of the heart, typically referring to the endocardium, myocardium, and epicardium that make up the heart's structure.

Muscle

Tissue in the body composed of fibers capable of contracting to produce movement or maintain the position of parts of the body.