Question

What is the gross anatomy of the respiratory system?

Answer 1

Respiratory system includes several organs which help us to breathe in and breathe out so that oxygen is supplied to the body and carbondioxide is expelled. Exchange of gases take place in alveoli of lungs.

Explanation:

http://cfile239.uf.daum.net/image/203F14464E50F8C62478D5

Air flows through the following track once inhaled:

external nostrils `rarr` nasal cavity/passage `rarr` internal nostrils/choanae `rarr` pharynx `rarr` glottis `rarr` larynx `rarr` wind pipe/trachea `rarr` primary bronchi `rarr` secondary bronchi `rarr` tertiary bronchi `rarr` bronchioles `rarr` terminal bronchioles `rarr` respiratory bronchioles `rarr` alveolar duct `rarr` alveoli

Same route is followed in reverse direction during exhalation.

http://cfile239.uf.daum.net/image/203F14464E50F8C62478D5

Through the lining of alveoli, exchange of gases take place. To know more about lungs and the act of breathing, see this: What are pleural membranes? What role do they play in respiration?.