21. What type of joint is the shoulder joint?
a) Ball and socket joint
b) Hinge joint
c) Pivot joint
d) Saddle joint
Answer: a) Ball and socket joint
22. Which muscle is responsible for bending the knee?
a) Quadriceps
b) Hamstrings
c) Gastrocnemius
d) Soleus
Answer: b) Hamstrings
23. Which bone is commonly known as the funny bone?
a) Ulna
b) Radius
c) Scapula
d) Clavicle
Answer: a) Ulna
24. Which muscle is responsible for maintaining posture?
a) Erector spinae
b) Rhomboids
c) Serratus anterior
d) Supraspinatus
Answer: a) Erector spinae
25. Which bone protects the heart and lungs?
a) Ribs
b) Sternum
c) Clavicle
d) Scapula
Answer: a) Ribs