The outer sac that encloses the heart and provides lubrication is the

A) myocardium.
B) endocardium.
C) ectocardium.
D) pericardium.
E) coronary capsule.

Pericardium

The pericardium is the fibrous sac that encloses the heart, providing it protection and the lubrication needed for its movements.

Lubrication

The process or technique of using a lubricant to reduce friction and wear between two surfaces in contact.