Which of the following associations correctly pairs a stage...

Name: Problem 2, Chapter :
Uploaded: 2020-07-08T01:00:35-08:00
Duration: 2 min 20 s
Channel: Dennis Howard
Description: Which of the following associations correctly pairs a stage of respiration with the muscle actions occurring during that stage? (A) Inhalation-diaphragm relaxes (B) Inhalation-internal intercostal muscles contract (C) Exhalation-diaphragm contracts (D)Exhalation-external intercostal muscles relax

Which of the following associations correctly pairs a stage of respiration with the muscle actions occurring during that stage? (A) Inhalation-diaphragm relaxes (B) Inhalation-internal intercostal muscles contract (C) Exhalation-diaphragm contracts (D)Exhalation-external intercostal muscles relax

Which of the following associations correctly pairs a stage of respiration with the muscle actions occurring during that stage?
(A) Inhalation-diaphragm relaxes
(B) Inhalation-internal intercostal muscles contract
(C) Exhalation-diaphragm contracts
(D)Exhalation-external intercostal muscles relax

Key Concepts

Passive Versus Active Respiratory Phases

Normal, quiet respiration is characterized by an active phase (inhalation) where muscles such as the diaphragm and external intercostals contract, and a passive phase (exhalation) where these muscles relax. During forced breathing, exhalation can become active through the involvement of muscles like the internal intercostals.

Diaphragm Function

The diaphragm is the primary muscle of respiration. It contracts during inhalation to increase the volume of the thoracic cavity, thereby reducing internal pressure and drawing air into the lungs. Conversely, during exhalation, particularly in quiet breathing, it relaxes, allowing the volume of the thoracic cavity to decrease passively.

External Intercostal Muscle Function

The external intercostal muscles are involved in the process of inhalation. They contract to elevate the ribs, which further increases the thoracic volume and aids in the expansion of the lungs. Their relaxation during exhalation assists in decreasing thoracic volume passively.

Internal Intercostal Muscle Function

The internal intercostal muscles are generally active during forced exhalation. Their contraction helps depress the ribs, actively reducing the volume of the thoracic cavity to expel air from the lungs, a mechanism distinct from the passive process observed in normal, quiet breathing.

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