Question

In human respiratory system, when a person breathes in, the position of ribs and diaphragm will be:

• A. lifted ribs and curve/dome shaped diaphragm.
• B. lifted ribs and flattened diaphragm.
• C. relaxed ribs and flattened diaphragm.
• D. relaxed ribs and curve/dome shaped diaphragm.

Answer 1

The Correct Option is B

Step 1: Understanding the process of inhalation:
Inhalation is the process where a person breathes in air. It involves the expansion of the lungs to allow air to flow in. This process is facilitated by the movement of the ribs and diaphragm.

Step 2: Movement of the ribs:
During inhalation, the muscles between the ribs, known as intercostal muscles, contract. This contraction causes the ribs to lift upwards and outward. The lifting of the ribs increases the volume of the thoracic cavity (the chest), allowing more space for the lungs to expand.

Step 3: Movement of the diaphragm:
The diaphragm, a large muscle that separates the chest cavity from the abdominal cavity, also plays a crucial role in breathing. During inhalation, the diaphragm contracts and moves downward (flattens). This further increases the volume of the thoracic cavity and allows the lungs to expand, drawing air in.

Step 4: Conclusion:
During inhalation, the ribs are lifted and the diaphragm is flattened. These movements help to increase the space in the chest, allowing the lungs to fill with air.

Correct Answer: Lifted ribs and flattened diaphragm.