PATHOLOGY

PATHOLOGY MCQ

RESPIRATORY SYSTEM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
During inspiration, the pressure inside the thoracic cavity decreases.
A
True
B
False
C
Either A or B
D
None of the above
Explanation: 

Detailed explanation-1: -When the lungs inhale, the diaphragm contracts and pulls downward. At the same time, the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside.

Detailed explanation-2: -During inhalation, the ribs move up and outward and the diaphragm moves in. this movement decrease the space in our chest cavity and the air rushes in. During exhalation, the ribs moves down and inward and the diaphragm moves up. This movement increases the space in our chest cavity and the air is pushed out.

Detailed explanation-3: -The correct option is A True. Inhalation: The diaphragm and intercostal muscles (the muscles that link the rib cage) contract during inhalation, causing the lung capacity to expand and the thoracic cavity to enlarge.

There is 1 question to complete.