Name: how the brain regulates breathing
Uploaded: 2024-06-20T13:02:58.000Z
Duration: 1 min 23 s
Channel: JoVE

呼吸の生理学的制御は、髄質と橋のニューロンに由来します。
髄質は呼吸に関与する筋肉に信号を送り、ポンは呼吸数を制御します。
一緒に、これらの呼吸中枢は呼吸の不随意制御を調節しますが、大脳皮質は呼吸の自発的な制御を可能にします。
最も重要な呼吸刺激剤は二酸化炭素です。それは呼吸の深さと速度の増加を引き起こします。
化学受容体は、動脈血のpHと二酸化炭素と酸素の分圧の変化を監視し、髄質と通信して神経インパルスを呼吸筋に送ります。
脊髄から、静脈神経、迷走神経、および後胸神経が上行呼吸経路に信号を送り、横隔膜と肋間筋を刺激します。
これらの筋肉の機能は、呼吸器系内の体積と圧力の変化を誘発することにより、換気を促進することを含みます。
その結果、この意識的な換気の努力は、過剰な二酸化炭素を排除すると同時に、体内の酸素レベルを高めるのに役立ちます。

呼吸の生理的制御

Physiological Control of Respiration

導入
呼吸は、一見受動的なプロセスのように見えますが、脳幹にある呼吸中枢によって制御されています。この中枢は、呼吸の不随意制御を調整します。つまり、呼吸は意識的な努力なしに行われ、スムーズで中断のないパターンを保証します。

換気の調節
身体は、動脈血中の二酸化炭素 (CO_2)、酸素 (O_2)、および水素イオン濃度 (pH) のレベルを監視することによって換気を維持します。これらの要因のうち、CO_2 レベルは換気制御において重要な役割を果たします。 CO_2 の増加により、呼吸制御システムがトリガーされ、呼吸の速度と深さが上昇し、呼気の増加によって過剰な CO_2 の除去が促進されます。

低酸素血症と換気制御
慢性肺疾患の患者は、継続的な高炭酸ガス血症を経験します。代償機構として、頸動脈および大動脈の化学受容体は低酸素血症に対して敏感になり、動脈血酸素濃度の低下を示します。これらの化学受容体は、血液の化学組成の変化を検出する特殊な細胞です。動脈血酸素レベルが特定の閾値を下回ると、これらの受容体は脳に信号を送り、換気の速度と深さを増加させます。化学受容体を介した低酸素血症と換気制御の間のこの相互作用は、慢性肺疾患患者の微妙なバランスを維持するのに役立ちます。

補足的低用量酸素療法
動脈血酸素レベルが 88% を下回る場合には、低用量の酸素の補給が必要になる場合があります。継続的な長期酸素投与は、蔓延している慢性肺疾患である COPD 患者の生存率を改善することが示されています。研究では、動脈血酸素レベルの管理、肺高血圧症などの合併症のリスクの軽減、COPD患者の全体的な健康状態の向上における酸素補給の利点が実証されています。

結論
呼吸の生理学的制御は、体内のガス交換を確実にするための複雑なメカニズムを含む多面的なプロセスです。 CO_2、O_2、pH などの要素間の相互作用を理解することは、換気の調節を理解する鍵となります。さらに、慢性肺疾患の管理における低酸素血症の重要性と低用量酸素補給療法の役割も強調されています。

紹介
呼吸は、一見受動的なプロセスですが、脳幹の呼吸中枢によって調節されています。このセンターは、不本意な...

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 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 extra CO2 can be removed during exhalation.

In chronic lung disease, many patients develop ongoing hypercarbia, which means elevated carbon dioxide in the blood. In this setting, chemoreceptors in the carotid artery and aorta become more sensitive to hypoxemia, or low arterial oxygen. These specialized cells detect changes in blood chemistry and send signals to the brain when oxygen levels drop below a certain threshold.

That signal causes ventilation to increase in both rate and depth. This response helps support the balance of gases in patients with chronic lung disease. If arterial oxygen falls below 88%, supplemental low-dose oxygen may be needed. Long-term oxygen therapy has been shown to improve survival in people with COPD, reduce the risk of complications such as pulmonary hypertension, and improve overall well-being.

How the Brain Regulates 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 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

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 the brainstem controls breathing by tracking CO2, O2, and pH. Explore hypoxemia, chemoreceptors, and low-dose oxygen therapy in COPD.

How the Brain Regulates Breathing | JoVE K12

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nursing

How the Brain Regulates Breathing

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