1. Musculoskeletal system are two body system that work together. These are skeletal system and
a. Respiratory system
b. muscular system
c. nervous system
d. digestive system

2. Which of these is a voluntary muscle?
a. Skeletal muscle
b. cardiac muscle
c. smooth muscle
d. none

3. The adult human body is composed of bones.
a. 502 bones
b. 333 bones
c. 226 bones
d. 206 bones​