Diseases That Affect the Ability of Skeletal Muscle to Contract

Diseases that affect the ability of skeletal muscle to contract are considered life threatening because

A) the movement of blood through the blood vessels of the body depends solely on skeletal muscle contractions.
B) respiratory movements depend on skeletal muscle contractions.
C) movement of food through the digestive tract depends on skeletal muscle contractions.
D) All of the choices are correct.