Question

What is the function of diaphragm in human respiratory system ? Where is it present in human body ?

Hint:

Remember: Increase in Volume = Decrease in Pressure (Boyle's Law application in biology). This is why air enters the lungs during inhalation.

Answer 1

Step 1: Understanding the Concept:
The diaphragm is a muscular structure essential for the mechanical process of breathing (ventilation).
Step 2: Detailed Explanation:
Location: The diaphragm is a dome-shaped sheet of skeletal muscle that forms the floor of the thoracic (chest) cavity and separates it from the abdominal cavity.
Functions:
1. Inhalation: When the diaphragm contracts, it moves downwards and flattens. This increases the volume of the thoracic cavity, lowering the air pressure inside the lungs, causing atmospheric air to rush in.
2. Exhalation: When the diaphragm relaxes, it moves upwards back into its dome shape. This decreases the thoracic volume, increasing the pressure inside the lungs and forcing air out.
Step 3: Final Answer:
The diaphragm is located at the base of the chest cavity and its primary function is to change thoracic volume to facilitate breathing.