Name: how the body pushes air out
Uploaded: 2024-06-20T13:02:58.000Z
Duration: 1 min 23 s
Channel: JoVE

呼気は、吸気筋が弛緩すると始まり、空気が伝導ゾーンから外部環境に移動します。
横隔膜が弛緩すると、胸膜腔が収縮し、肺に圧力がかかります。
肺活量が減少すると、肺胞が圧迫され、肺胞圧が上昇します。
歯槽圧が大気圧を超えると、空気が流れ出します。
胸膜腔は、呼吸中に肺が膨張および収縮するための摩擦のない空間を提供します。
さらに、呼気は肺の弾性反動から生じ、筋肉の収縮を伴いません。
苦痛を伴う呼気中、腹筋が横隔膜を前方に押し出し、胸腔が収縮すると同時に、内部の肋間筋が胸郭を下げ、胸部の容積を減少させます。
有効期限は、自発的なものもあれば、非自発的なものもあります。
自発的な呼気では、肺内の空気が一定の速度で保持および放出されます(たとえば、発話中の呼気を制御します)。
逆に、不随意の呼気は代謝機能にとって不可欠であり、睡眠中の呼吸のように意識的に制御されていません。

呼吸のメカニズム ii: 呼気

Mechanism of Breathing II: Expiration

呼気の生理学: シームレスな呼吸プロセス
呼気、または吐き出すことは、吸気筋が弛緩し始めるときに始まる複雑な生理学的プロセスです。この弛緩は、呼吸器系の効率を象徴する一連の現象を引き起こします。

有効期限のメカニズム:

<ol style="padding-left: 35px; margin: 0;">
 <li style="margin: 8px 0;">横隔膜の弛緩：横隔膜の筋肉が弛緩すると、上方に移動し、胸腔内の容積が減少します。この重要な筋肉の弛緩が、呼気の初期段階における主な推進力となります。</li>
 <li style="margin: 8px 0;">胸腔内圧の上昇：横隔膜が弛緩した後に胸腔が収縮します。この収縮により肺に圧力がかかり、肺の容積が減少します。肋骨の間にある肋間筋も呼気時に収縮します。この動作により肋骨が下方および内側に引っ張られ、胸腔のサイズがさらに縮小します。</li>
 <li style="margin: 8px 0;">肺胞の圧縮: 肺の容積が減少すると、肺胞が圧縮され、肺胞圧が上昇します。この圧力は体外の大気圧よりも高くなります。</li>
 <li style="margin: 8px 0;">肺からの空気の流れ: 内圧が高まると空気が肺から排出され、スムーズで楽な空気の流出が促進されます。</li>
</ol>

肺と胸壁の間の空間である胸腔は、呼吸サイクル中の肺のリズミカルな拡張と収縮に対応する、微調整されたステージのように機能します。筋肉の努力と肺組織の自然な弾性反動も呼気を促進し、肺からの空気の排出を助けます。

活動的呼気: 激しい呼吸や、歌う、管楽器の演奏、重量挙げなどの激しい身体運動など、強制的な呼気を必要とする活動の際には、追加の筋肉が働きます。
<ul style="padding-left: 35px;">
 <li style="list-style-type: disc; margin: 8px 0;">腹部の筋肉: これらの筋肉は収縮して横隔膜をさらに上方に押し上げ、胸腔容積の減少を促進します。</li>
 <li style="list-style-type: disc; margin: 8px 0;">内肋間筋: これらの筋肉は胸郭を下げるのに役立ち、胸郭容積をさらに減少させ、より力強い呼気を助けます。</li>
</ul>

自発的呼気と非自発的呼気: この区別を理解することは、呼吸プロセスの完全な複雑さを理解するために重要です。
<ul style="padding-left: 35px;">
 <li style="list-style-type: disc; margin: 8px 0;">自発的呼気: 話したり歌ったりするときなどのこのタイプの呼気には、空気の流れを正確に調節するために呼吸を意識的に制御する必要があります。</li>
 <li style="list-style-type: disc; margin: 8px 0;">不本意な呼気: この自動的なプロセスは生命を維持するために非常に重要であり、睡眠中であっても意識的な努力なしで継続的に機能します。</li>
</ul>

呼吸のメカニズム II: 呼気

呼気の生理学:シームレスな呼吸プロセス
呼気、または呼気は、吸気として始まる複雑な生理学的プロセスです...

Education

JoVE Core

Nursing

看護

Unit 1

ユニット1

Vital Signs: Respiration

バイタルサイン：呼吸

KEY TERMS AND CONCEPTS

主要用語および概念

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 smaller. As lung volume drops, the alveoli, or tiny air sacs, are compressed.

When the alveoli are compressed, alveolar pressure rises. It becomes higher than the atmospheric pressure outside the body. Air then moves out of the lungs. The pleural cavity supports this rhythmic expansion and contraction, and the elastic recoil of lung tissue also helps exhalation.

Some expiration is active and needs extra muscle effort. This happens during forced breathing, such as singing, playing wind instruments, or heavy exercise like weightlifting. In these cases, the abdominal muscles push the diaphragm farther up, and the internal intercostal muscles lower the rib cage to make expiration more forceful.

Expiration can also be voluntary or involuntary. Voluntary expiration is under conscious control, such as during speech or singing, when airflow must be carefully regulated. Involuntary expiration happens automatically and continues without conscious effort, even during sleep.

How the Body Pushes Air Out

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

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

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

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...

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 expiration works as the diaphragm relaxes, chest volume drops, and air leaves the lungs. Includes active breathing and voluntary vs. involuntary exhalation.

How the Body Pushes Air Out | JoVE K12

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nursing

How the Body Pushes Air Out

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