The correct option is 1 only
Explanation
The human respiratory system includes specialized structures such as the larynx and epiglottis, which manage airflow, sound production, and the separation of the digestive and respiratory tracts.
- Statement 1 is Correct: The larynx is a cartilaginous box located at the upper end of the trachea. It helps in sound production and is commonly referred to as the sound box.
- Statement 2 is Incorrect: The primary function of the epiglottis is to prevent the entry of food into the larynx. During swallowing, the glottis (the opening of the windpipe) is covered by the epiglottis to ensure food enters the oesophagus rather than the respiratory tract.
- Statement 3 is Incorrect: The epiglottis is a thin flap made of elastic cartilage. It is not a fibrous flap devoid of elasticity; its elastic nature allows it to spring back to its open position after swallowing to restore airflow.
Key Takeaway: The larynx is the cartilaginous voice box responsible for sound production. The epiglottis is an elastic cartilaginous flap that acts as a valve to prevent food aspiration into the windpipe during swallowing.