Name: how air moves into the lungs
Uploaded: 2024-06-20T13:02:58.000Z
Duration: 1 min 30 s
Channel: JoVE

呼吸器系は、伝導ゾーンと呼吸ゾーンで構成されています。
鼻腔、気管、気管支などの伝導ゾーンは、肺を通過する空気をろ過、洗浄、温め、加湿するのに役立ちます。
呼吸領域は、細気管支、肺胞管、肺胞で構成されており、空気と血液のガス交換を可能にします。
呼吸プロセスには、口や鼻から肺に空気を吸い込んだり、吸い込んだり、続いて空気を吐き出したりします。
吸気は、吸気筋(横隔膜と外側の肋間筋)が収縮するときに発生します。
横隔膜の収縮により、胸腔と胸膜腔が拡張します。対照的に、外側の肋間筋の収縮は肋骨と胸骨を持ち上げます。
骨苦しい吸入中に、胸鎖乳突筋、前鋸筋、広背筋、小胸筋と大胸筋、後上鋸筋などの副吸気筋も収縮することがあります。
吸気筋の力と肺組織の弾力性により、肺の体積が増加します。
その結果、肺胞腔内の空気圧が大気圧以下に低下し、肺に空気が流れ込む原因となります。

呼吸のメカニズム i: インスピレーション

Mechanism of Breathing I: Inspiration

インスピレーションの紹介: 呼吸器系の働き
呼吸に不可欠なネットワークである呼吸器系は、伝導ゾーンと呼吸ゾーンで構成され、それぞれが呼吸のプロセス全体において重要な役割を果たしています。呼吸サイクルの第 1 段階である吸気または吸気の詳細なメカニズムを調べてみましょう。

吸気時の空気の通り道
吸気中、空気は鼻または口から体内に入り、鼻腔、気管、気管支などの伝導ゾーンを通って移動します。これらの構造は、空気を濾過、加温、加湿し、肺へ向かう準備を整える上で重要です。空気が呼吸域に到達すると、細気管支、肺胞管を通過し、最後に肺胞に入り、そこでガス交換が行われます。

インスピレーションの筋肉の仕組み
吸気は、主吸気筋である横隔膜と外肋間筋の収縮から始まります。

<ul style="padding-left: 35px; list-style: disc;">
 <li>横隔膜: 横隔膜は収縮すると平らになって下に移動し、胸腔を垂直に拡張します。</li>
 <li>外肋間筋: これらの筋肉は、肋骨と胸骨を持ち上げて胸腔をさらに拡張し、胸腔内圧を軽減するのに役立ちます。</li>
</ul>

運動中や呼吸困難中など、より激しい呼吸シナリオでは、胸腔の拡張を促進するために副吸気筋が動員されます。これらの筋肉には次のものが含まれます。

<ul style="padding-left: 35px; list-style: disc;">
 <li>胸鎖乳突筋</li>
 <li>鋸歯状の前部</li>
 <li>最も広い背中</li>
 <li>小胸筋と大胸筋</li>
 <li>鋸歯状後部上部</li>
</ul>

肺拡張のダイナミクス
これらの筋肉が協調して収縮することで、肺の容積が増加します。この膨張により肺胞内の圧力が大気圧以下に低下し、肺に空気を送り込む圧力勾配が生じます。肺組織の弾力性はこの体積変化を助け、肺胞腔への効率的な空気の流れを確保します。

結論
呼吸がどのように生命を支えているかを理解するには、インスピレーションに関わる筋肉と解剖学的構造の動的な相互作用を理解することが重要です。このプロセスには、簡単な空気の取り込みと、重要な細胞機能を維持するために不可欠な効率的なガス交換を保証する高度な生理学的メカニズムが含まれます。

呼吸のメカニズム I: インスピレーション

インスピレーションの紹介:呼吸器系の実践
呼吸に不可欠なネットワークである呼吸器系は、伝導性と...

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 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 the air before it continues deeper into the lungs.

The air then moves into the respiratory zone. It passes through the bronchioles and alveolar ducts and reaches the alveoli, the tiny air sacs where gas exchange takes place. This route prepares the body to bring oxygen into the lungs and support respiration.

Inspiration starts when the diaphragm and external intercostal muscles contract. The diaphragm flattens and moves downward, which expands the thoracic cavity vertically. The external intercostal muscles lift the ribs and sternum, which helps enlarge the chest cavity and lowers intra-thoracic pressure.

When breathing becomes more forceful, such as during exercise or respiratory distress, accessory inspiratory muscles can help. These muscles include the sternocleidomastoid, serratus anterior, latissimus dorsi, pectoralis minor and major, and serratus posterior superior. Their added action helps the thoracic cavity expand further.

As the chest expands, lung volume increases. This lowers the pressure inside the alveoli below atmospheric pressure and creates a pressure gradient that pulls air into the lungs. The natural elasticity of lung tissue supports this change and helps air flow efficiently into the alveolar spaces.

How Air Moves Into the Lungs

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

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

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

Explore how inspiration works as the diaphragm, rib muscles, and accessory muscles expand the chest and draw air into the alveoli for gas exchange.

How Air Moves Into the Lungs | JoVE K12

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nursing

How Air Moves Into the Lungs

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