In the given diagram, what should be P, Q, R and S respectively?

Step-by-step solution

Based on the anatomical structure of the human respiratory system shown in the diagram: P points to the U-shaped bone located above the larynx, which is the hyoid bone. Q points to the large, shield-shaped cartilage forming the anterior wall of the larynx (often called the Adam's apple), which is the thyroid cartilage. R points to the leaf-shaped cartilaginous flap that covers the glottis during swallowing, which is the epiglottis. S points to the tube extending downwards from the larynx, supported by C-shaped cart