Muscles and Bones 

21. What type of joint is the shoulder joint?

a) Ball and socket joint

b) Hinge joint

c) Pivot joint

d) Saddle joint

22. Which muscle is responsible for bending the knee?

a) Quadriceps

b) Hamstrings

c) Gastrocnemius

d) Soleus

23. Which bone is commonly known as the funny bone?

a) Ulna

b) Radius

c) Scapula

d) Clavicle

24. Which muscle is responsible for maintaining posture?

a) Erector spinae

b) Rhomboids

c) Serratus anterior

d) Supraspinatus

25. Which bone protects the heart and lungs?

a) Ribs

b) Sternum

c) Clavicle

d) Scapula