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

호기는 흡기 근육이 이완되어 공기가 전도 영역에서 외부 환경으로 이동할 때 시작됩니다.
횡격막의 이완은 흉막강을 수축시켜 폐에 압력을 가하게 합니다.
폐 부피가 감소하면 폐포가 압박되고 폐포 압력이 증가합니다.
폐포압이 대기압을 초과하면 공기가 흘러나옵니다.
흉강은 호흡하는 동안 폐가 팽창하고 수축할 수 있는 마찰 없는 공간을 제공합니다.
또한 호기는 폐의 탄성 반동으로 인해 발생하며 근육 수축을 포함하지 않습니다.
힘겨운 숨을 내쉬는 동안, 복부 근육은 횡격막을 앞으로 밀어내어 흉강을 수축시키고, 동시에 내부 늑간 근육은 흉곽을 낮추고 흉곽 부피를 감소시킵니다.
만료는 자발적일 수도 있고 비자발적일 수도 있습니다.
자발적 호기에서는 폐의 공기가 고정된 비율로 유지되고 방출됩니다(예: 언어 중 제어된 숨).
반대로, 비자발적 호기는 신진대사 기능에 필수적이며 수면 중 호흡과 같이 의식적으로 통제할 수 없습니다.

호흡 메커니즘 ii: 호기

Mechanism of Breathing II: Expiration

호기의 생리학: 원활한 호흡 과정

호기는 흡기 근육이 이완되기 시작하면서 시작되는 복잡한 생리적 과정입니다. 이러한 이완은 호흡 시스템의 효율성을 대표하는 일련의 사건을 촉발합니다.
만료 메커니즘: 

<ul style=" list-style: disc; padding-left: 25px;">
 <li>횡격막 이완: 이 과정의 핵심 역할을 하는 횡격막 근육이 이완되면서 위쪽으로 움직여 흉강의 부피가 감소합니다. 이 중요한 근육의 이완은 호기 초기 단계의 주요 동인입니다.</li>
 <li>흉막압의 증가: 횡격막이 이완된 후 흉막강이 수축됩니다. 이러한 수축은 폐에 압력을 가하여 폐용적을 감소시킵니다. 갈비뼈 사이에 위치한 늑간근도 호기 중에 수축됩니다. 이 작용은 갈비뼈를 아래쪽과 안쪽으로 끌어당겨 흉강의 크기를 더욱 감소시킵니다.</li>
 <li>폐포 압축: 폐 용적이 감소함에 따라 폐포가 압축되어 폐포 압력이 증가합니다. 이 압력은 신체 외부의 대기압보다 높아집니다.</li>
 <li>폐 밖으로의 공기 흐름: 내부 압력이 높을수록 공기가 폐 밖으로 배출되어 원활하고 수월하게 공기가 빠져나가게 됩니다.</li>
</ul>

폐와 흉벽 사이의 공간인 흉막강은 호흡 주기 동안 폐의 리드미컬한 팽창과 수축을 조절하면서 미세하게 조정된 무대 역할을 합니다. 근육의 노력과 폐 조직의 자연적인 탄성 반동도 호기를 촉진하여 폐에서 공기를 배출하는 데 도움을 줍니다.

활동적 호기: 격렬한 호흡이나 노래, 관악기 연주 또는 역도와 같은 무거운 신체 활동과 같이 강제 호기가 필요한 활동 중에는 추가 근육이 작용합니다.

<ul style=" list-style: disc; padding-left: 25px;">
 <li>복부 근육: 이 근육은 수축하여 횡경막을 더 위쪽으로 밀어 흉부 용적의 감소를 강화합니다.</li>
 <li>내부 늑간 근육: 이 근육은 흉곽을 낮추고 흉곽 부피를 더욱 감소시키며 보다 강력한 호기를 돕습니다.</li>
</ul>

자발적 호기와 비자발적 호기: 이 차이점을 이해하는 것은 호흡 과정의 전체 복잡성을 파악하는 데 중요합니다.

<ul style=" list-style: disc; padding-left: 25px;">
 <li>자발적 호기: 말하거나 노래할 때와 같은 이러한 유형의 호기에는 공기 흐름을 정확하게 조절하기 위해 호흡을 의식적으로 제어하는 것이 포함됩니다.</li>
 <li>비자발적 호기: 이 자동 과정은 수면 중에도 의식적인 노력 없이도 지속적으로 기능하여 생명을 유지하는 데 중요합니다.</li>
</ul>

호흡 메커니즘 II: 호기

호기의 생리학: 원활한 호흡 과정
호기 또는 내쉬는 것은 흡기로 시작되는 복잡한 생리학적 과정입니다.

Education

교육

JoVE Core

Nursing

간호학

Unit 1

제1단원

Vital Signs: Respiration

활력 징후: 호흡

KEY TERMS AND CONCEPTS

핵심 용어 및 개념

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

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.

nursing

How the Body Pushes Air Out

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