Muscles and Bones 

16. Which muscle is responsible for breathing?

a) Diaphragm

b) Pectoralis major

c) Trapezius

d) Gluteus maximus

17. Which bone is commonly known as the thigh bone?

a) Femur

b) Patella

c) Tibia

d) Fibula

18. Which muscle is responsible for extending the forearm?

a) Biceps brachii

b) Triceps brachii

c) Brachialis

d) Brachioradialis

19. How many pairs of ribs does the human body have?

a) 8

b) 10

c) 12

d) 14

20. Which muscle is responsible for flexing the hip joint?

a) Hamstrings

b) Quadriceps

c) Biceps femoris

d) Psoas major