Answer
d.
Work Step by Step
Option a. is incorrect. The muscular system, sometimes in conjunction with the skeletal system, produces movement.
Option b. is incorrect. The muscular system protects bones and joints as well as provides an additional layer of protection for internal organs.
Option c. is incorrect. The muscular system produces heat by shivering, which generates heat by using ATP.
Option d. is correct. The muscular system does not store calcium. Calcium is mainly stored in the bones of the skeletal system.
