Direction: Read each question. Choose the letter of the correct answer.
1. How does a muscle pull a bone?
A. The muscle expands.
B. The muscle contracts.
C. The muscle twists.
D. The muscle flattens out.
2. Which type of muscle is involved in the beating of the heart
A. cardiac muscle
B. smooth muscle
C. skeletal muscle
D. all muscles
3. Which of the following protect the heart and lungs from injury?
A. skull and breastbone
B. shoulder blade and collarbones
C. ribs and collarbones
D. ribs and breastbone
4. Which of the following components of the skeletal system holds two bones
together
A. cartilage
B. Joint
C. Ligament
D. Tendon​