Name: accessory muscles that support breathing
Uploaded: 2024-06-20T13:02:58.000Z
Duration: 1 min 21 s
Channel: JoVE

呼吸过程始于吸气。膈肌作为主要的呼吸肌，收缩并下降，产生负压，从而促进空气吸入。
同时，肋骨间的肋间肌收缩，导致肋骨向外扩张，为肺部的扩张提供更大的空间。
当一个人进行深呼吸或呼吸困难时，辅助呼吸肌会被激活。颈部的胸锁乳突肌会抬起胸骨，从而实现更大的肺部扩张。
颈部的斜角肌有助于提升第二和第三肋骨，进一步促进胸腔扩张。
在上胸部和肩部前方，胸小肌可上提第三、第四和第五肋骨，有助于深呼吸时胸腔的扩张。
当人呼气时，膈肌和肋间肌放松，胸腔容积减小，从而将空气排出肺部。
在用力呼气过程中，腹肌等辅助呼吸肌可能会收缩，向上推动膈肌，以更有力地排出空气。
这一过程持续进行，将氧气注入血液，并促进身体功能的正常运作。

呼吸机制 iii：辅助肌肉

Mechanism of Breathing III: The Accessory Muscles

辅助肌肉在呼吸系统中的作用

呼吸系统是一个复杂的网络，依赖于膈肌等主要呼吸肌，但也涉及辅助肌肉，以增强吸气和呼气过程中的肺部扩张和气流。

用辅助肌肉增强吸气：

当需要额外的呼吸时，例如深呼吸或应对呼吸挑战时，辅助肌肉（例如胸锁乳突肌、斜角肌、肋间肌和腹部肌肉）至关重要。这些肌肉通过帮助更显着的肺扩张来优化肺功能：

<ul style="list-style-type: disc; margin-left: 35px;">
	<li>胸锁乳突肌：位于颈部，该肌肉提升胸骨，促进胸腔扩张，这对于深吸气至关重要。</li>
	<li>斜角肌：这些肌肉也位于颈部，有助于抬高第二和第三肋骨，在剧烈呼吸时进一步有助于胸部扩张。</li>
	<li>胸小肌：位于上胸部和肩膀前部，这块肌肉有助于抬高第三、第四和第五肋骨，增强胸部扩张，从而增加吸气时的肺活量。</li>
</ul>

这些辅助肌肉对于最大限度地增加空气摄入量至关重要，确保足够的氧气到达血液以支持重要的身体功能。

促进呼气：

<ul style="list-style-type: disc; margin-left: 35px;">
	<li>正常呼气时，主要肌肉（例如膈肌和肋间肌）放松，减少胸腔空间，促进空气从肺部排出。</li>
	<li>在需要用力呼气的情况下，例如剧烈的体力活动或咳嗽，辅助肌肉，特别是腹部肌肉，会积极参与。这些肌肉收缩以向上推隔膜，有助于更有力地排出空气。</li>
</ul>

了解主要呼吸肌和辅助呼吸肌之间复杂的相互作用对于理解呼吸机制至关重要。这些知识不仅有助于诊断和治疗呼吸系统疾病，还可以提高改善呼吸系统健康干预措施的有效性。对于研究人员和医疗保健专业人员来说，详细了解这些肌肉的功能可以更深入地了解呼吸生理学并制定有针对性的治疗策略。

呼吸机制 III：辅助肌肉

呼吸系统中辅助肌肉的作用
呼吸系统是一个复杂的网络，依赖于膈肌等主要呼吸肌……

mechanism-of-breathing-iii-the-accessory-muscles

Education

教育

JoVE Core

Nursing

护理学

Unit 1

第一单元

Vital Signs: Respiration

生命体征：呼吸

KEY TERMS AND CONCEPTS

关键术语与概念

accessory muscles that support breathing

Accessory muscles help the respiratory system expand the chest and move air when breathing needs extra effort. The diaphragm is still the main breathing muscle, but other muscles can assist during inhalation and exhalation. This support becomes important during deep breathing or when the body faces breathing challenges.

Several accessory muscles help with inhalation. The sternocleidomastoid, which is in the neck, lifts the sternum and helps the chest cavity expand. The scalene muscles also sit in the neck and raise the second and third ribs. The pectoralis minor, found in the upper chest and front of the shoulders, elevates the third, fourth, and fifth ribs. Together, these muscles increase lung expansion and help more oxygen reach the bloodstream.

Accessory muscles also assist with exhalation, especially when air must leave the lungs more forcefully. During normal exhalation, the diaphragm and intercostal muscles relax, and the chest cavity becomes smaller. During forced exhalation, such as while exercising hard or coughing, the abdominal muscles contract and push up against the diaphragm. This action helps expel air from the lungs more strongly.

Understanding how primary and accessory respiratory muscles work together helps explain breathing mechanics. It also supports the study of respiratory conditions and the design of treatments that improve respiratory health. For students, this topic shows how the body adjusts breathing to meet changing demands.

Accessory Muscles That Support Breathing

respiration

Respiratory System and Gas Exchange

The respiratory system supports energy production by bringing oxygen into the body and removing carbon dioxide. In human cells, oxidation uses food molecules and oxygen to produce carbon dioxide and water. This process helps sustain life and depends on the respiratory system. Air moves through a pathway that includes the nose, oropharynx, larynx, trachea, bronchi, bronchioles, and lungs. Air enters through the nose and mouth, passes through the pharynx, and then moves through the larynx, which...

physiological control of respiration

How the Brain Regulates Breathing

How the brain regulates breathing is controlled by the respiratory center in the brainstem. This center manages involuntary breathing, so respirations continue without conscious effort and stay smooth and steady. Ventilation is maintained by monitoring carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration, or pH, in arterial blood. CO2 is the most important signal in this control system. When CO2 rises, the respiratory control system increases the rate and depth of breathing so...

respiration and gaseous exchange

How Heart and Lungs Exchange Gases

Heart and lung function work together to move oxygen and carbon dioxide through the body. This gas exchange depends on the cardiovascular system, which includes the heart and blood vessels, and on the respiratory system, which brings air to the alveoli and removes waste gases. The heart is a cone-shaped muscular pump at the center of this system. It has four chambers: two atria on top and two ventricles below. The atria receive blood from veins, including the superior and inferior vena cava...

mechanism of breathing i: inspiration

How Air Moves Into the Lungs

Air enters the lungs through a coordinated breathing process called inspiration, or inhalation. This is the first phase of the respiratory cycle. The respiratory system includes the conducting zone and the respiratory zone, and both help move air toward the place where gas exchange occurs. During inspiration, air comes in through the nose or mouth and passes through the conducting zone. This pathway includes the nasal cavity, trachea, and bronchi. These structures filter, warm, and humidify...

mechanism of breathing ii: expiration

How the Body Pushes Air Out

Expiration is the process of pushing air out of the lungs. It begins when the inspiratory muscles relax. That relaxation starts a chain of changes in the chest and lungs. As the diaphragm relaxes, it moves upward. This lowers the volume of the thoracic cavity, or chest space. The pleural cavity also contracts and presses on the lungs. The intercostal muscles, which sit between the ribs, help during this phase too. They pull the ribs downward and inward. This makes the chest cavity even...

mechanism of breathing iii: the accessory muscles

Accessory muscles help the respiratory system expand the chest and move air when breathing needs extra effort. The diaphragm is still the main breathing muscle, but other muscles can assist during inhalation and exhalation. This support becomes important during deep breathing or when the body faces breathing challenges. Several accessory muscles help with inhalation. The sternocleidomastoid, which is in the neck, lifts the sternum and helps the chest cavity expand. The scalene muscles also sit...

factors affecting respiration

How Breathing Changes in Different Conditions

Respiration changes with age, activity, health, and the environment. It is the process of exchanging oxygen (O2) and carbon dioxide (CO2) between the body and the surroundings. Many factors can alter how fast and how deeply a person breathes. Newborns usually breathe faster than older children and adults. Their respiratory rate can range from thirty to sixty breaths per minute because their metabolic needs are higher. As people age, metabolic rate often decreases, and breathing tends to slow. <br...

respiratory assessment: purpose and indications

respiratory-assessment-purpose-and-indications

Breathing Checks in Patient Monitoring

Respiratory assessment is a key part of patient monitoring in nursing. It helps detect early signs of clinical deterioration. Breathing changes often appear before other signs of worsening health, so nurses watch respiratory rate, breathing pattern, and breath sounds closely. A complete respiratory assessment goes beyond counting breaths. It includes inspection, which means looking at chest symmetry, effort, and use of accessory muscles. It also includes palpation, or feeling for tenderness,...

assessment of airway, skin color, and use of accessory muscles

assessment-of-airway-skin-color-and-use-of-accessory-muscles

Respiratory Signs to Check During Breathing

Respiratory assessment starts with checking the airway, skin color, and use of accessory muscles during breathing. These signs give quick clues about respiratory status and possible complications. A clear airway, normal skin color, and no accessory muscle use usually point to effective oxygenation and perfusion. Airway assessment is an important first step in any health check. Clinicians look for anything that could block breathing, such as vomit, a foreign object, or the tongue. In a...

assessment of ventilation i: respiratory rate

assessment-of-ventilation-i-respiratory-rate

Checking Breathing Patterns and Respiratory Rate

Ventilation assessment helps monitor a patient’s health status by checking breathing patterns and respiratory rate. Respiration is one of the easiest vital signs to observe. It can also show problems in several body systems, including serious issues such as brainstem injury after head trauma. Accurate assessment depends on unobtrusive observation. The patient should not know they are being watched, because awareness can change breathing patterns. A full evaluation also considers the patient’s...

assessment of ventilation ii: respiratory depth and rhythm

assessment-of-ventilation-ii-respiratory-depth-and-rhythm

Watching Breathing Depth and Rhythm

Breathing depth and rhythm help show how a person is ventilating. Respiratory depth is the amount of air inhaled or exhaled in one breath. It may be shallow or deep, and it usually stays steady when a person is resting or asleep. A deep sigh is an automatic deep breath that fills the lungs with more air than normal breathing. Respiratory depth is checked by watching chest excursion, or chest movement. Deep respiration shows full lung expansion and complete exhalation. Shallow respiration moves...

assessment of diffusion and perfusion

Gas Exchange Checks in Respiratory Care

Gas exchange checks in respiratory care focus on diffusion, perfusion, oxygen saturation, and capnography. These measures help show how well the lungs and blood vessels move oxygen in and remove carbon dioxide from the body. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. In the lungs, oxygen diffuses from the alveoli, the tiny air sacs, into the bloodstream. Carbon dioxide, which is made during cell metabolism, moves from the...

respiratory volumes and capacities i

Breathing Rates and Pattern Changes

Breathing rate and rhythm are important signs of respiratory health. A complete one-minute count helps show the patient’s breathing pattern. Even a small rise of three to five breaths per minute can be an early sign of respiratory distress. Patients with a rate above twenty-four breaths per minute need close monitoring for possible changes in body function. Normal and abnormal respirations have clear names. Eupnea means normal, gentle breathing with a regular rate and rhythm, usually twelve to...

alterations in respiration ii

Breathing Patterns and Their Clinical Meaning

Breathing patterns can be regular, deep, or shallow, and they can also become abnormal. These changes help explain how ventilation is affected in different conditions. Clinically, they are important because they can guide patient evaluation. Biot's breathing is irregular in both rate and depth. It alternates between deep gasping breaths and apnea, which is a pause in breathing. It may occur with increased intracranial pressure or damage to the brain's respiratory center, such as from stroke,...

respiratory volumes

Measuring Lung Air Volumes

Respiratory volumes measure how much air moves in and out of the lungs during breathing. These values help assess lung function, support diagnosis of respiratory conditions, and track overall respiratory health. Each measurement gives a different view of how the lungs work. Tidal volume (TV) is the air inhaled or exhaled in one normal breath. In adults, it is about 500 milliliters per breath. It serves as the baseline volume for resting breathing. Minute volume (MV) is the total air exchanged...

respiratory capacities

Lung Capacity Measures in Breathing

Lung capacity measures show how much air the respiratory system can move and hold during different parts of breathing. These measures help describe lung function in a more complete way. They are useful for understanding how the lungs work during inhaling and exhaling. Inspiratory capacity, or IC, is the maximum amount of air that can be inhaled with full effort. It is found by adding tidal volume and inspiratory reserve volume. IC usually ranges from 2.4 to 3.6 liters. Functional residual...

special considerations while measuring oxygen saturation

special-considerations-while-measuring-oxygen-saturation

Checking Breathing Rate and Oxygen Levels

Checking breathing rate and oxygen levels helps assess how well a patient is breathing. Respiratory rate is the number of breaths taken in one minute. Oxygen saturation shows how much oxygen is being delivered to the body’s tissues. Together, these signs give a fuller picture of respiratory function. The normal adult breathing rate is usually 12 to 20 breaths per minute. A lower rate may suggest respiratory depression or decreased oxygen levels. A rate above 20 breaths per minute may point to...

assessment of respiration

Respiratory Assessment Signs and Findings

Respiratory assessment looks at the signs and findings that show how well a person is breathing. It uses both subjective data and objective data to judge respiratory health. The respiratory system’s basic structures and main functions provide the basis for this check. Subjective assessment starts with an interview. Nurses ask about medical history, medicines, current symptoms, past respiratory problems like asthma or COPD, surgeries, and allergies. Family history also matters because it can...

key terms and concepts

Learn how accessory muscles help with deep inhalation and forced exhalation, including the sternocleidomastoid, scalenes, pectoralis minor, and abdominals.

Accessory Muscles That Support Breathing | JoVE K12

JoVE Core Nursing offers concise animated lessons on nursing practices, covering health systems, nursing organizations, and health concepts. It includes practical communication, infection prevention, and nursing fundamentals, providing students with a clear understanding of nursing principles.

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Accessory Muscles That Support Breathing

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