Question

Draw a neat labelled diagram of the respiratory organs of human being.

Hint:

Remember: The {alveoli} are the actual site of gas exchange, not the lungs as a whole.

Answer 1

Step 1: Concept of Human Respiratory System
The human respiratory system is responsible for the exchange of gases – mainly oxygen (O$_2$) and carbon dioxide (CO$_2$). It consists of several organs that work together to ensure proper breathing and cellular respiration. The main organs include the nose, pharynx, larynx, trachea, bronchi, lungs, and alveoli.
Step 2: Diagram (to be drawn by student)
A neat labelled diagram should include the following:
Nose/Nasal cavity – entry point of air.
Pharynx – common passage for air and food.
Larynx – voice box.
Trachea – windpipe with cartilaginous rings.
Bronchi – two branches leading into lungs.
Lungs – main site of respiration.
Bronchioles – smaller branches inside lungs.
Alveoli – tiny air sacs where gas exchange occurs.
Diaphragm – muscular sheet controlling breathing.
Step 3: Final Note
The diagram must be neat, clearly labelled, and proportionate. Marks are awarded for correctness and neatness.