Question

Assertion: The lungs are situated in the thoracic chamber which is anatomically an air-tight chamber.
Reason: Such an arrangement is essential to avoid any change in pulmonary volume.
A)Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B)Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C)Assertion is correct but Reason is incorrect
D)Both Assertion and Reason are incorrect

Answer 1

Hint: The second largest hollow space in the body is the thoracic cavity, also called the chest cavity. It is surrounded by the ribs, vertebral column, and sternum, or breastbone, and is divided by a muscular and membranous partition, the diaphragm, from the abdominal cavity (the largest hollow space in the body).

Complete answer:
The thoracic cavity, also called the chest cavity, is a vertebrate cavity bound on the sides and top by the rib cage, and on the bottom by the diaphragm. The thoracic vertebrae, which attach to the ribs that surround the cavity, link the chest cavity. In fact, the thoracic cavity consists of three spaces, each lined with mesothelium, a special film-like tissue separating vital organs. While the pericardial cavity surrounds and protects the lungs, the pleural cavities surround the lungs.
In the thoracic cavity, which is an anatomically air-tight chamber, the lungs are found. The anatomical arrangement of the lungs in the thorax is such that the (pulmonary) cavity of the lungs will indicate any change in the volume of the thoracic cavity. For breathing, such an arrangement is necessary, as we can not directly adjust Pulmonary volume.

Let us analyze the options to find out the correct option.

Option A, B and D: These are irrelevant and incorrect options.
Option C: Assertion is true but reason is false. Therefore, this is the correct option.

Hence, the correct answer is option (C)

Note: 1)The lungs are surrounded by a pleural cavity for protection.
2)The thoracic cavity protects organs like lungs from damage.
3)Rib cage surrounds the thoracic cavity.