What does the $Adam's \text{ } apple$ represent?

Intercostal muscles are found in ...........

Name the three main parts of the pharynx.

Identify the component of the respiratory system which displays the features given below and choose the correct option:
$I.$ Double layered
$II.$ Fluid contained in it reduces the friction on the lung surface
$III.$ Its outer layer is in contact with the thoracic wall
$IV.$ Its inner layer is in contact with the lungs

What is the length of the pharynx (in $cm$)?

The trachea divides into right and left: