GENERAL HISTOLOGY

Detailed explanation-1: -The terminal bronchioles divide further to form several generations of respiratory bronchioles, which are the narrowest airways in the lungs that give rise to alveolar ducts and alveolar sacs (respiratory bronchioles and alveoli form the respiratory zone).

Detailed explanation-2: -Correct answer: The largest airway structure is the trachea. This branches into two smaller bronchi, which enter the left and right lung and bifurcate further into smaller bronchioles. The bronchioles give way into the smallest structures of the lung, the tiny grape-like clusters of alveoli.

Detailed explanation-3: -Air is inhaled through the mouth or the nose. The sequence of air passage during inhalation is as follows: Nostrils→pharynx→larynx→trachea→alveoli.

Detailed explanation-4: -The bronchioles consist of first the terminal bronchioles, then the respiratory bronchioles, and finally the alveolar sacs (which allow for gas exchange).

Detailed explanation-5: -Open the airway using the head-tilt, chin-lift maneuver. Pinch the nostrils shut for mouth-to-mouth breathing and cover the person’s mouth with yours, making a seal. Give the first rescue breath, lasting one second, and watch to see if the chest rises. If it rises, give the second breath.