Dominic Stone
Coughing is a defensive airway reflex that occurs when dust or foreign particles enter the respiratory tract. This stimulates the cough receptors, which send impulses via the vagus nerve to a 'cough centre' in the medulla of the brain. The cough centre then generates an efferent signal that travels to the expiratory muscles to produce the cough. The diaphragm, intercostal muscles, abdominal muscles, and other major inspiratory and expiratory muscles contract, creating a negative pressure around the lungs and increasing the pressure of air within them. This sudden release of air dislodges any irritants and clears the airways. The main function of coughing is to maintain airway clearance by removing mucus and foreign bodies from the respiratory tract.
| Characteristics | Values |
|---|---|
| Cough mechanism | The diaphragm and external intercostal muscles contract, creating negative pressure around the lungs. |
| Muscles involved | Diaphragm, abdominal, intercostal, glottis, external intercostals, and other major inspiratory and expiratory muscles. |
| Nerves involved | Vagus nerve, superior laryngeal nerve, phrenic nerve, segmental intercostal nerves, spinal motor nerves |
| Cough reflex | Stimulation of cough receptors in the respiratory tract by dust or foreign particles. |
| Cough types | Mechanosensory-induced, chemosensory-induced |
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What You'll Learn
- The diaphragm and intercostal muscles contract, creating negative pressure around the lungs
- The abdominal muscles contract, increasing pressure behind the epiglottis
- The vocal cords relax and the glottis opens, releasing air
- The bronchi and trachea collapse, clearing irritants from the respiratory lining
- The cough reflex arc: afferent pathway, central pathway, and efferent pathway
The diaphragm and intercostal muscles contract, creating negative pressure around the lungs
Coughing is a defensive airway reflex that occurs when stimulation of cough receptors in the respiratory tract by dust or foreign particles triggers a response. This response involves the contraction of the diaphragm and intercostal muscles, which creates negative pressure around the lungs.
The diaphragm is the main inspiratory muscle and plays a crucial role in the coughing mechanism. During inspiration, it contracts and moves downwards, increasing the vertical diameter of the thoracic cavity and facilitating lung expansion, which draws air into the lungs. During a cough, the diaphragm contracts, creating negative pressure and aiding in the expulsion of irritants from the respiratory tract.
The intercostal muscles are also essential during a cough. These muscles are located between the ribs and assist in the respiratory process. There are three types of intercostal muscles: external, internal, and innermost. During a cough, the external intercostal muscles contract, working in conjunction with the diaphragm to create negative pressure and facilitate the forceful expulsion of air, which dislodges any foreign particles or irritants.
The sequential activation and coordination of the diaphragm, intercostal muscles, and other respiratory muscles ensure an effective cough reflex. This complex neuromuscular networking results in the rapid expulsion of air, which can exceed 100 mph, effectively clearing the airways and protecting the lungs from potential damage caused by foreign particles, irritants, or infectious respiratory diseases.
The contraction of the diaphragm and intercostal muscles during a cough is a well-coordinated process that contributes to the overall effectiveness of the cough reflex. The negative pressure created by their contraction plays a crucial role in maintaining airway clearance and respiratory health.
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The abdominal muscles contract, increasing pressure behind the epiglottis
The abdominal muscles are essential for coughing. They are the primary accessory expiratory muscles, including the rectus abdominis, external oblique, internal oblique, and transversus abdominis. These muscles contract during the expiratory phase of coughing, increasing pressure behind the epiglottis. This contraction occurs in conjunction with the diaphragm's relaxation and the other expiratory muscles, which results in increased air pressure within the lungs.
The abdominal muscles' contraction plays a crucial role in the violent muscular activity of coughing. It helps to counteract the distortion of the chest wall, ensuring effective coughing. The electrical activity of these muscles during coughing has been extensively studied, providing valuable insights into their role in this reflex action.
The cough reflex is a defensive airway response that protects the respiratory tract from foreign particles, such as dust, and chemicals like sulfur dioxide gas. The reflex involves the stimulation of cough receptors in the respiratory tract, which triggers a series of events. Firstly, the vocal cords open wide, allowing additional air into the lungs.
The epiglottis then closes off the windpipe, and the abdominal and rib muscles contract, increasing pressure behind the closed epiglottis. This pressure buildup forces air out at high speed, creating a rushing sound as it exits through the vocal cords. The force of the expelled air dislodges any irritants or foreign particles, effectively clearing the airways and restoring comfortable breathing.
The abdominal muscles' contraction during coughing is a well-coordinated and precisely timed action, orchestrated by complex neuromuscular networking involving the diaphragm, chest, glottis, and brain. This synergy between the inspiratory and expiratory muscles ensures the effectiveness of the cough reflex, protecting the respiratory system from potential harm.
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The vocal cords relax and the glottis opens, releasing air
The cough reflex is a defensive mechanism that protects the body from foreign particles entering the respiratory tract. When dust or foreign particles enter the respiratory tract, cough receptors are stimulated, triggering a series of events that lead to coughing. This reflex involves the activation of various muscles, including the vocal cords, which play a crucial role in the process.
During a cough, the vocal cords initially relax, allowing the glottis to open. This relaxation of the vocal cords is a critical step in the coughing process, as it enables the release of air at a high velocity. As the glottis opens, air rushes out at speeds exceeding 100 mph, dislodging any irritants or foreign particles that may be present in the respiratory tract.
The vocal cords, also known as the voice box or larynx, are highly sensitive to external stimuli. When irritants enter the respiratory tract, the vocal cords react by relaxing and opening up, creating a pathway for air to escape. This rapid release of air is what we experience as a cough.
The glottis, a component of the larynx, consists of the opening between the vocal cords and the space above and below them. During a cough, the glottis plays a pivotal role by opening wide, facilitating the expulsion of air. This opening of the glottis is a coordinated response, ensuring that foreign particles are efficiently cleared from the respiratory system.
The process of coughing involves the intricate coordination of multiple muscles and neural pathways. The vagus nerve, a key component of the cough reflex arc, transmits signals to the glottis, vocal cords, and other respiratory muscles. This neural activation triggers the sequential activation of expiratory muscles, resulting in a powerful cough that clears the airways.
In summary, the relaxation of the vocal cords and the opening of the glottis during a cough are essential steps that enable the release of air at high speed. This mechanism effectively clears foreign particles and irritants from the respiratory tract, protecting the lungs and maintaining respiratory health.
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The bronchi and trachea collapse, clearing irritants from the respiratory lining
Coughing is a defensive airway reflex that involves the sequential activation of several laryngeal and respiratory muscles. The main inspiratory muscle, the diaphragm, contracts and moves downwards, increasing the vertical diameter of the thoracic cavity and expanding the lungs, which draws air in. The diaphragm and external intercostal muscles contract, creating a negative pressure around the lungs.
The abdominal muscles contract to accentuate the action of the relaxing diaphragm, while the other expiratory muscles contract, increasing the pressure of air within the lungs. The vocal cords relax and the glottis opens, releasing air at over 100 mph.
The bronchi and non-cartilaginous portions of the trachea collapse, forming slits through which the air is forced, clearing out any irritants attached to the respiratory lining. This prevents foreign material from reaching the lungs. The trachea, larynx, and carina are especially sensitive to foreign particles, and the cough reflex is triggered when these receptors are stimulated.
The accessory expiratory muscles involved in coughing include the abdominal muscles: rectus abdominis, external oblique, internal oblique, and transversus abdominis. The contraction of the abdominal muscles increases the pressure behind the epiglottis, which forcefully expels the air, creating a rushing sound as it moves past the vocal cords.
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The cough reflex arc: afferent pathway, central pathway, and efferent pathway
Coughing is an important defensive reflex that occurs through the stimulation of a complex reflex arc. The cough reflex occurs when stimulation of cough receptors in the respiratory tract by dust or other foreign particles produces a cough, which causes rapidly moving air that usually removes the foreign material before it reaches the lungs.
The cough reflex arc is constituted by the afferent pathway, the central pathway, and the efferent pathway. The afferent pathway involves sensory nerve fibres (branches of the)
The diaphragm, the most important respiratory muscle, contracts during a cough, as do the intercostal muscles and abdominal muscles. The contraction of these muscles results in thoraco-abdominal volume variations to provide enough air to be expelled. The abdominal muscles contract to accentuate the action of the relaxing diaphragm, and the other expiratory muscles contract as well. These actions increase the pressure of air within the lungs.
The cough reflex may be impaired in individuals with weak abdominal and respiratory muscles, which can be caused by disease conditions leading to muscle weakness or paralysis, prolonged inactivity, or surgery involving these muscles. Bed rest can interfere with the expansion of the chest and limit the amount of air taken into the lungs in preparation for coughing, resulting in a weak and ineffective cough.
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Frequently asked questions
A cough is a defensive airway reflex that occurs when dust or other foreign particles enter the respiratory tract. The vocal cords open, allowing air to pass through into the lungs. The epiglottis then closes off the windpipe, and the abdominal and rib muscles contract, increasing the pressure behind the epiglottis. The air is then expelled, dislodging the irritant.
The main muscle involved in coughing is the diaphragm. The abdominal muscles, external intercostal muscles, internal intercostal muscles, and innermost intercostal muscles are also involved. The accessory inspiratory muscles include the sternocleidomastoid, scalenus anterior, medius, and posterior, and the pectoralis major and minor. The accessory expiratory muscles include the rectus abdominis, external oblique, internal oblique, and transversus abdominis.
A cough occurs when stimulation of cough receptors in the respiratory tract produces a cough reflex. Impulses travel via the internal laryngeal nerve, a branch of the superior laryngeal nerve, to the medulla of the brain. The relevant signals are then transmitted back from the cerebral cortex and medulla via the vagus and superior laryngeal nerves to the glottis, external intercostals, diaphragm, and other major inspiratory and expiratory muscles.
If you have weak abdominal and respiratory muscles, your cough reflex may be impaired. This can be caused by disease conditions leading to muscle weakness or paralysis, prolonged inactivity, or surgery involving these muscles. Bed rest can also interfere with the expansion of the chest, limiting the amount of air that can be taken into the lungs and resulting in a weak and ineffective cough.
