Question

Q Starting from the nasal cavity describe the path of air from its entrance in the nasal cavity to its utilisation in the air sac.

Answer 1

we can breathe through both lungs and our lungs as well. but it is advised to breathe through nose because our nassal passage is lined up with hair and mucus which filters the air entering our body and prevents dirt from entering the body . from the nassal passage the air enters trachea or wind pipe which is surrounded by c -shaped cartilagenous rings which helps to prevent collapsing of wind pipe during inhalation and exhalation. now the air goes into bonchi which end into the two parts of lungs . each bronchi is further divided into several bronchioles . each bronchiole have a grape or sac like structure called alvouli which is lined up with thick blood vessels and thus helps in easy diffusion of gasses . now co2 rich air is easily taken out of the body through the same path....

hope this ans would help u

Answer 2

Answer:

Air enters through the nose (and sometimes the mouth), moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi and bronchioles till the alveoli.

Explanation:

The pathway of air in the respiratory system starts with the external organs of the nose and mouth.

  Nose: Air is inhaled through the nostrils (and sometimes through the mouth) where it is filtered by the hairs and cilia to remove dust particles and moistened. The nasal cavity also moderates the temperature of the inhaled air.

  Pharynx: This is a common passage for food, water, and air. It leads from both the nose and the mouth and leads to both the trachea (windpipe) and the oesophagus (foodpipe).

  Larynx: This is the voice box situated just over the trachea and has a flap called the epiglottis which closes during swallowing to prevent food from entering the trachea and opens during breathing.

  Trachea: Air now enters the windpipe which is situated behind the sternum (breastbone) and between the two lungs.

  Bronchus: From the trachea, two bronchi (one bronchus for each lung) enter the lungs and divide and subdivide into secondary and tertiary bronchi, getting narrower as they proceed into the lung.

  Bronchioles: The tertiary bronchi branch into fine tubules called bronchioles, the last passageways for air.

  Alveoli:. Air ends its pathway in the alveoli (sing. alveolus) which are tiny sacs with very fine singe-celled walls. These alveoli are surrounded by capillaries that connect the pulmonary arteries and veins and that enable transfer of oxygen and carbon dioxide.

Explanation: