Which structure in humans is analogous to the spiracles of a cockroach?

What are the characteristics of alveoli?

'$XX$' is a part of the respiratory system that contains $C$-shaped rings of hyaline cartilage. '$XX$' is lined with ciliated,pseudostratified columnar epithelium. Identify '$XX$'.

During swallowing,the glottis can be covered by a thin elastic cartilaginous flap called $A$ to prevent the entry of food into the larynx. The trachea is a straight tube extending up to the $B$ cavity,which divides at the level of the $5^{th}$ thoracic vertebra into right and left primary $C$. Choose the correct option for $A, B$,and $C$ from the given four options to complete the above statement with reference to the $NCERT$ textbook.

The division of mammalian lungs into a very large number of tiny alveoli around alveolar ducts opening into bronchioles is:

Adam's apple is another name for