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Exhalation, or expiration, is the process of breathing out, when air leaves the lungs. During normal breathing, exhalation is a passive process, driven by the elastic recoil of the lungs and muscles. The diaphragm and the intercostal muscles are the primary muscles involved in respiration. During exhalation, the diaphragm and external intercostal muscles relax, and the internal intercostal muscles assist in lowering the rib cage, adding force to exhalation. During vigorous exercise, the abdominal muscles are the most important muscles used for exhalation, contracting and pushing a relaxed diaphragm against the lungs to force air out.
| Characteristics | Values |
|---|---|
| Muscles used for exhaling | Diaphragm, intercostal muscles, abdominal muscles |
| Types of intercostal muscles | External, internal, innermost |
| Function of external intercostal muscles | Raises each rib toward the rib above, assisting in inhalation |
| Function of internal intercostal muscles | Assist in lowering the rib cage, adding force to exhalation |
| Accessory muscles | Sternocleidomastoid, scalene, serati anterior |
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What You'll Learn
- The diaphragm relaxes, causing the lungs to recoil and air to flow out
- Intercostal muscles assist in exhaling by lowering the rib cage
- Abdominal muscles contract, raise abdominal pressure, and push air out
- The internal intercostals, intercostalis intimi, subcostals aid forceful exhalation
- During exercise, expiratory muscles play an active role in breathing
The diaphragm relaxes, causing the lungs to recoil and air to flow out
The diaphragm is the major muscle responsible for breathing. It is a thin, dome-shaped muscle that separates the abdominal cavity from the thoracic cavity. During inhalation, the diaphragm contracts, compressing the abdominal cavity and raising the ribs outward and upward, which expands the thoracic cavity and draws air into the lungs.
When the diaphragm relaxes, the lungs recoil and return to their original volume, causing the thoracic cavity to decrease in size and forcing air out of the lungs. This process is called exhalation or expiration, and it is passive when a person is not exercising. The elasticity of the lungs and chest wall, stretched during inhalation, causes them to return to their resting shape and expel air from the lungs when the diaphragm relaxes. Therefore, when an individual is at rest, no effort is needed to breathe out.
During vigorous exercise, however, a number of muscles participate in exhalation, including the abdominal muscles, which are the most important for this process during physical activity. The abdominal muscles contract, raising abdominal pressure and pushing the relaxed diaphragm against the lungs, which causes air to be pushed out.
The intercostal muscles, which are the muscles between the ribs, also play a role in exhalation. These muscles assist in lowering the rib cage, adding force to exhalation.
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Intercostal muscles assist in exhaling by lowering the rib cage
The intercostal muscles are one of the most important groups of respiratory muscles, alongside the diaphragm. They are attached between the ribs and play a role in manipulating the width of the rib cage. There are three layers of intercostal muscles: external, internal, and innermost. The external intercostal muscles are the most important in respiration, assisting in inhalation by raising the rib cage. During inhalation, the intercostal muscles contract and assist in the elevation of the ribs and sternum, expanding the thoracic cavity.
The internal intercostal muscles have fibres that are angled obliquely downward and backward from rib to rib. These muscles assist in lowering the rib cage, adding force to exhalation. During exhalation, the diaphragm relaxes, and the lungs recoil back to their original volume, decreasing the size of the thoracic cavity and forcing air out of the lungs.
The intercostal muscles are located in the intercostal spaces between the ribs. The external intercostals are the most superficial layer of the three groups, while the internal and innermost intercostals are deeper layers. The intercostal muscles receive blood supply from anterior and posterior intercostal arteries, as well as internal thoracic and musculophrenic arteries.
During quiet breathing, there is little to no muscle contraction involved in exhalation. The process is driven by the elastic recoil of the lungs and chest wall as they return to their resting shape. However, during vigorous exercise or when the elasticity of the lungs is reduced, active exhalation can be achieved by the contraction of abdominal wall muscles and internal intercostal muscles.
The abdominal muscles are the most important during exercise-induced exhalation. They contract, raise abdominal pressure, and push against a relaxed diaphragm, causing air to be exhaled. The intercostal muscles, particularly the internal intercostals, work alongside the abdominal muscles to enhance the force of exhalation by lowering the rib cage.
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Abdominal muscles contract, raise abdominal pressure, and push air out
The abdominal muscles are sometimes involved in the breathing process, specifically in exhaling or breathing out. During quiet breathing, exhalation is usually passive, as the elasticity of the lungs and chest wall, which are actively stretched during inhalation, causes them to return to their resting shape and expel air out of the lungs. Therefore, when a person is at rest, no effort or muscle contraction is needed to breathe out.
During vigorous exercise, however, the abdominal muscles contract, raising abdominal pressure and pushing air out of the lungs. The abdominal muscles push a relaxed diaphragm against the lungs, causing air to be pushed out. The muscles used in breathing can contract only if the nerves connecting them to the brain are intact.
The diaphragm is the major muscle responsible for breathing. It is a thin, dome-shaped muscle that separates the abdominal cavity from the thoracic cavity. During inhalation, the diaphragm contracts, so that its centre moves caudally (downward) and its edges move cranially (upward). This compresses the abdominal cavity, raises the ribs upward and outward, and thus expands the thoracic cavity. This expansion draws air into the lungs.
When the diaphragm relaxes, elastic recoil of the lungs causes the thoracic cavity to contract, forcing air out of the lungs, and returning to its dome shape. The diaphragm is the main inspiratory muscle, and during inspiration, it contracts and moves in an inferior direction, increasing the vertical diameter of the thoracic cavity and producing lung expansion.
In addition to the diaphragm, the intercostal muscles are one of the most important groups of respiratory muscles. These muscles are attached between the ribs and are important in manipulating the width of the rib cage. There are three layers of intercostal muscles: external, internal, and innermost intercostal muscles. The external intercostal muscles are most important in respiration. These have fibres that are angled obliquely downward and forward from rib to rib. The contraction of these fibres raises each rib toward the rib above, with the overall effect of raising the rib cage, assisting in inhalation.
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The internal intercostals, intercostalis intimi, subcostals aid forceful exhalation
The act of breathing is defined as pulmonary ventilation, which involves inhaling air into the lungs and exhaling it out. The diaphragm and a variety of other muscles are involved in the process of ventilation. The diaphragm is the major muscle responsible for breathing. It is a thin, dome-shaped muscle that separates the abdominal cavity from the thoracic cavity.
The intercostal muscles are one of the most important groups of respiratory muscles. These muscles are attached between the ribs and play a role in manipulating the width of the rib cage. There are three layers of intercostal muscles: external intercostal muscles, internal intercostal muscles, and innermost intercostal muscles. The external intercostal muscles are the most important in respiration. They have fibres that are angled obliquely downward and forward from rib to rib. The contraction of these fibres raises each rib toward the rib above, with the overall effect of raising the rib cage, assisting in inhalation.
The internal intercostal muscles, intercostalis intimi, and subcostals aid forceful exhalation. The internal intercostal muscles have fibres that are angled obliquely downward and backward from rib to rib. These muscles assist in lowering the rib cage, adding force to exhalation. During forced exhalation, portions of the internal intercostal muscles, the inferior serratus posterior muscles, and the transverse thoracic muscle pull the ribs inward and downward, forcing air out of the lungs. Muscles of the abdominal wall are also recruited for forced exhalation. The abdominal muscles that aid forceful exhalation include the rectus abdominis, transverse abdominis, external oblique muscle, and internal oblique muscle.
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During exercise, expiratory muscles play an active role in breathing
During exercise, the body's metabolic requirements increase, and the mechanics of the breathing pattern are adjusted so that the work performed by the respiratory muscles is minimised. The breathing cycle is controlled by the respiratory centre located inside the medulla oblongata and the pons of the brain stem.
The diaphragm and a variety of other muscles are involved in the process of ventilation. The diaphragm, located below the lungs and spanning across the entire body, plays an integral role in the respiratory system. During inspiration, the diaphragm contracts, causing an increase in space in the thoracic cavity, which enables the lungs to expand. During expiration, the diaphragm relaxes, and the lungs recoil back to their original volume, and air flows out.
The accessory expiratory muscles, including the abdominal muscles, also play an active role in breathing during exercise. The abdominal muscles act on the abdomen and the abdominal rib cage and are expiratory. During inspiration, the abdominal muscles relax, and during expiration, they contract. This mechanism prevents rib cage distortion, unloads the diaphragm, and decreases the volume of the abdomen below resting levels.
In addition to the diaphragm and abdominal muscles, other muscles that assist in forceful expiration include the internal intercostals, intercostalis intimi, subcostals, and the external and internal intercostals. The internal intercostal muscles pull the ribs downwards and inward, further reducing the size of the thoracic cavity. The external and internal intercostals work together with the sternocleidomastoid and scalene muscles on the neck to elevate the ribs during inhalation.
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Frequently asked questions
The diaphragm and intercostal muscles are the primary muscles used for exhaling. The diaphragm relaxes and the lungs recoil to their original volume, decreasing the size of the thoracic cavity and forcing air out of the lungs.
The abdominal muscles are the most important muscles for forceful exhalation. They contract, raise abdominal pressure, and push a relaxed diaphragm against the lungs, causing air to be pushed out. Other muscles that help in forceful exhalation include the internal intercostals, subcostals, and the rectus abdominis.
Inspiration is when air moves into the lungs, and expiration is when air leaves the lungs. During inspiration, the diaphragm contracts, raising the ribs and sternum, and expanding the thoracic cavity. During expiration, the diaphragm relaxes, the lungs recoil, and the thoracic cavity decreases in volume, forcing air out of the lungs.
