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Related Concept Videos

Gas Exchange and Transport01:20

Gas Exchange and Transport

Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.
Respiration01:24

Respiration

Overview of the Respiratory System and Energy Production
Energy production in the human body is primarily fueled by oxidation, a process where food molecules are burned by combining with oxygen to produce carbon dioxide and water. This vital metabolic process sustains life, and is supported intricately by the respiratory system.
Structure and Function of the Respiratory System:
The respiratory system is a complex network of structures that includes the nose, oropharynx, larynx, trachea,...
Respiration and Gaseous Exchange01:20

Respiration and Gaseous Exchange

The intricate interplay between the cardiovascular and respiratory systems is crucial for efficiently transporting respiratory gases throughout the body. Let us explore the cardiovascular system's multifaceted functions, emphasizing its pivotal role in gas exchange.
Respiration involves the exchange of gases, especially oxygen (O2) and carbon dioxide (CO2), between the alveoli and body cells, a process facilitated by blood circulation. As a result, the cardiovascular system, which involves the...
Physical Principles Governing Gas Exchange01:16

Physical Principles Governing Gas Exchange

Gas behavior plays a vital role in understanding bodily processes such as external and internal respiration. External respiration involves the diffusion of oxygen into the blood and carbon dioxide out of it in the lungs. In contrast, internal respiration happens in body tissues, where these gases move in opposite directions.
Gas Laws Governing Respiration
The behavior of gases is guided by Dalton's Law of partial pressures and Henry's Law.
Dalton's Law asserts that the total pressure exerted by...
External and Internal Respiration01:24

External and Internal Respiration

External respiration occurs in the lungs, and it is the first step in the journey of oxygen inside the body. When we inhale, oxygen enters our lungs and diffuses across the thin alveolar membrane. The alveoli are tiny, air-filled sacs that provide a vast surface area for gas exchange. Oxygen in the alveoli has a higher partial pressure (105 mmHg) than in the adjacent pulmonary capillaries (40 mmHg), establishing a pressure gradient. As a result, oxygen molecules move from the alveoli into the...
Physiology of Respiration I: Functions of the Respiratory System01:27

Physiology of Respiration I: Functions of the Respiratory System

The respiratory system is crucial for exchanging oxygen (O2) and carbon dioxide (CO2) between the atmosphere and the bloodstream, maintaining the body's balance. Beyond gas exchange, it helps regulate acid-base balance, purify inhaled air, and enable vocalization.
Fundamental Processes in Respiration:

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Related Experiment Video

Updated: Jul 3, 2026

Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department
07:52

Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department

Published on: January 29, 2011

Respiratory gases.

S G Jenkinson, J I Peters

    Clinics in Chest Medicine
    |September 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    This review covers oxygen, carbon dioxide, and helium, common respiratory gases. These gases enter circulation, impacting lungs and distant organs, and are discussed for their metabolism, pharmacology, and therapeutic applications.

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    Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method

    Published on: February 2, 2024

    Area of Science:

    • Medical Physiology
    • Pharmacology
    • Respiratory Medicine

    Background:

    • Respiratory gases readily enter human circulation via alveolar-capillary diffusion.
    • Gases in circulation can exert local (pulmonary) and systemic (distant organ) effects.
    • Oxygen, carbon dioxide, and helium are frequently utilized in respiratory medicine.

    Purpose of the Study:

    • To review the metabolism, pharmacology, and therapeutic uses of key respiratory gases.
    • To highlight the physiological impact of inhaled gases on the human body.
    • To provide a comprehensive overview for practitioners in respiratory medicine.

    Main Methods:

    • Literature review of scientific articles and clinical studies.
    • Synthesis of information on gas metabolism and pharmacodynamics.
    • Analysis of therapeutic applications and clinical outcomes.

    Main Results:

    • Detailed examination of oxygen's role in cellular respiration and its therapeutic uses.
    • Exploration of carbon dioxide's physiological functions and its clinical management.
    • Overview of helium's properties and its application in specific respiratory conditions.

    Conclusions:

    • Oxygen, carbon dioxide, and helium possess distinct metabolic and pharmacologic profiles.
    • Understanding these profiles is crucial for optimizing their therapeutic efficacy.
    • These gases represent vital tools in managing a range of respiratory and systemic conditions.