Question

QUESTION 7

1. Which of the following best describes residual lung volume?

   	A.	The air volume normally in the lungs
   	B.	The air volume between the lung tissues
   	C.	The air volume remaining in the lungs even after exhaling as deeply as possible
   	D.	The air volume in the lungs after inhaling as deeply as possible question 7

Answer 1

Q7. Option C is correct.

Explanation

Residual Lung volume is the air volume remaining in the lungs after exhaling as deeply as possible or in other words the amount of air left in the lungs at the end of a maximal expiration.

It is significant as it aerates the blood in between breathing and during expiration and it maintains the contour of the lung.

Normal adult value is averaged at 1200ml(20‐25 ml/kg) .It is indirectly measured from the summation of FRC (Functional residual capacity) and ERV (Expiratory Reserve volume) and cannot be measured by spirometry.

Options A and B are incorrect as they don't define any exact situation and can be considered an incomplete term to define.

Option D is incorrect The air volume in the lungs after inhaling as deeply as possible is called the Inspiratory Capacity.