Abdominal breathing occurs when the abdomen rises and falls with each breath but the chest does not. if a person is breathing abdominally, what would this suggest?

select one:
a. his rib muscles are no longer contracting with each inspiration.
b. his diaphragm is no longer contracting with each inspiration.
c. his diaphragm is no longer contracting with each exhalation.

The correct answer is-

a. His rib muscles are no longer contracting with each inspiration.

The muscles that are involved in the process of breathing ( inspiration and expiration) are diaphragm ( that separates chest cavity and the abdominal cavity), intercostal muscles, and accessory muscles.

Abdominal is also known as diaphragmatic breathing, which is the most  efficient as well as relaxed way of taking air into the lungs. During inspiration, the external intercostal muscles and diaphragm undergo contraction, which causes the expansion of rib cage leading it to move outward.

On the other hand, during exhalation, the abdominal muscles and internal intercostals participate in forcing the air out of the lungs.

This suggests that rib muscles are no longer contracting with each inspiration in case of  breathing abdominally.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

the dark variety, as they are not visible on the dark tree barks

explanation: