Question

Which among the following statements is correct?
A. Normal breathing rate of a person is $15$ to $18$ times per minute.
B. Total area of gas exchange seen in the whole alveoli in two lungs is $36$ to $72$ square meter.
C. The total volume of air breathed in and out in the cycle of inhalation and exhalation is $500{\text{ }}ml$.
D. Wind pipe is supported by rings of cartilage in order to avoid its collapse when there is less air in it.
A) A, B and C
B) A, B, C and D
C) A, B and D
D) B, C and D

Answer 1

We breathe by inhaling through our nose and exhaling through our mouth. Inhalation is the process of bringing oxygen-rich air into the body and expiration is the process of removing carbon dioxide-rich air from the body. Both of these processes occur on a regular basis during breathing. As a result, a breath is defined as one inhale & one exhale.

Complete answer:
Statement:A - The normal breathing rate of a person is $12 - 18$ times per minute.
Thus, the statement is correct.
Statement:B - A human adult has around $300$ million bronchi, which may span an area of approximately $180$ metre square. As a result, the total area of the gas exchange visible in two lungs' whole alveoli is $36$ to $72$ square meters.
Thus, the statement is correct.
Statement:C - The total volume of air breathed in and out in the cycle of inhalation and exhalation is $500{\text{ }}ml$ and is known as tidal volume. Total $2000 - 6000{\text{ }}ml$ per minute air is exhaled or inhaled.
Thus, this statement is also correct.
Statement:D - The trachea is another name for the windpipe. The windpipe is a cartilaginous tube with C-shaped cartilaginous rings that links the throat and larynx to the lungs, allowing air to travel through, and is found in virtually all animals with lungs. As a result, cartilage rings support the windpipe to prevent it from collapsing when there is less air in it.
Thus, this statement is also correct.
Based on the analysis of statements
Option:A is incorrect because all statements are correct.
Option:B is correct because all four statements are correct.