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

A expiração começa quando os músculos inspiratórios relaxam, fazendo com que o ar saia da zona condutora para o ambiente externo.
O relaxamento do diafragma faz com que a cavidade pleural se contraia e exerça pressão sobre os pulmões.
À medida que o volume pulmonar diminui, ele comprime os alvéolos e aumenta a pressão alveolar.
Quando a pressão alveolar excede a pressão atmosférica, o ar flui para fora.
A cavidade pleural fornece um espaço sem atrito para o pulmão se expandir e contrair durante a respiração.
Além disso, a expiração resulta do recolhimento elástico dos pulmões e não envolve contrações musculares.
Durante a expiração laboriosa, os músculos abdominais empurram o diafragma para frente, fazendo com que a cavidade torácica se contraia; simultaneamente, os músculos intercostais internos abaixam a caixa torácica e diminuem o volume torácico.
A expiração pode ser voluntária ou involuntária.
Na expiração voluntária, o ar nos pulmões é retido e liberado a uma taxa fixa - por exemplo, expiração controlada durante a fala.
Por outro lado, a expiração involuntária é vital para as funções metabólicas e não está sob controle consciente, como a respiração durante o sono.

mecanismo da respiração ii: expiração

Mechanism of Breathing II: Expiration

<div>
A Fisiologia da Expiração: Um Processo Respiratório Harmonioso 

A expiração, ou exalação, é um processo fisiológico complexo que começa quando os músculos inspiratórios começam a relaxar. Esse relaxamento desencadeia uma série de eventos que resumem a eficiência do sistema respiratório.

Mecanismo da Expiração: 

<ol style="display: flex; flex-direction: column; gap: 10px;">
	<li>Relaxamento do Diafragma: À medida que o músculo diafragma, peça-chave nesse processo, relaxa, ele se move para cima, reduzindo o volume da cavidade torácica. O relaxamento desse músculo crítico é o principal impulsionador na fase inicial da expiração.</li>
	<li>Aumento da Pressão Pleural: A cavidade pleural se contrai após o diafragma relaxar. Essa contração exerce pressão sobre os pulmões, causando diminuição do volume pulmonar. Os músculos intercostais, situados entre as costelas, também se contraem durante a expiração. Essa ação puxa as costelas para baixo e para dentro, diminuindo ainda mais o tamanho da cavidade torácica.</li>
	<li>Compressão dos Alvéolos: À medida que o volume pulmonar diminui, os alvéolos são comprimidos, o que aumenta a pressão alveolar. Essa pressão torna-se maior do que a pressão atmosférica fora do corpo.</li>
	<li>Fluxo de Ar para Fora dos Pulmões: A pressão interna mais alta impulsiona o ar para fora dos pulmões, facilitando um fluxo suave e sem esforço.</li>
</ol>

A cavidade pleural, um espaço entre os pulmões e a parede torácica, atua como um palco bem ajustado, acomodando a expansão e contração rítmica dos pulmões durante o ciclo respiratório. O esforço muscular e o recolhimento elástico natural do tecido pulmonar também facilitam a expiração, auxiliando a expelir o ar dos pulmões.

Expiração Ativa: Durante a respiração vigorosa ou atividades que exigem expiração forçada, como cantar, tocar instrumentos de sopro ou esforço físico intenso como levantamento de peso, músculos adicionais entram em ação:

<ul style="list-style-type: disc; display: flex; flex-direction: column; gap: 10px; padding: 0 0 0 40px;">
	<li>Músculos abdominais: Esses músculos se contraem para empurrar o diafragma ainda mais para cima, intensificando a redução do volume torácico.</li>
	<li>Músculos Intercostais Internos: Esses músculos ajudam a abaixar a caixa torácica, diminuindo ainda mais o volume torácico e auxiliando na expiração mais forçada.</li>
</ul>

Expiração Voluntária versus Involuntária: Compreender essa distinção é crucial para compreender toda a complexidade do processo respiratório.

<ul style="list-style-type: disc; display: flex; flex-direction: column; gap: 10px; padding: 0 0 0 40px;">
	<li>Expiração Voluntária: Esse tipo de expiração, como durante a fala ou o canto, envolve o controle consciente da respiração para regular o fluxo de ar com precisão.</li>
	<li>Expiração Involuntária: Esse processo automático é crucial para a sustentação da vida, funcionando continuamente sem esforço consciente, mesmo durante o sono.</li>
</ul>


</div>

Mecanismo da Respiração II: Expiração

A fisiologia da expiração: um processo respiratório contínuo
A expiração, ou expiração, é um processo fisiológico complexo que começa como o inspiratório ...

Education

JoVE Core

Nursing

Enfermagem

Unit 1

Unidade 1

Vital Signs: Respiration

Sinais Vitais: Respiração

KEY TERMS AND CONCEPTS

TERMOS E CONCEITOS-CHAVE

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

JoVE Core - Enfermagem oferece animações concisas sobre práticas de enfermagem, abrangendo sistemas de saúde, organizações de enfermagem e conceitos de saúde. Ele inclui comunicação prática, prevenção de infecções e fundamentos de enfermagem, proporcionando aos alunos uma compreensão clara dos princípios de enfermagem.

How the Body Pushes Air Out

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