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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,...
Physiological Control of Respiration01:23

Physiological Control of Respiration

Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
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...
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...
Cellular Respiration01:18

Cellular Respiration

Cellular respiration is a crucial metabolic process through which cells obtain energy from organic substances, mainly glucose, to produce adenosine triphosphate (ATP). This process includes the oxidation of substrates and the transfer of electrons to a separate electron acceptor, facilitating ATP synthesis through a sequence of biochemical reactions.Glycolysis: The Initial StepGlycolysis is the first stage of cellular respiration, occurring in the cytoplasm of both prokaryotic and eukaryotic...

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Related Experiment Video

Updated: May 9, 2026

High-Resolution Respirometry to Assess Bioenergetics in Cells and Tissues Using Chamber- and Plate-Based Respirometers
09:53

High-Resolution Respirometry to Assess Bioenergetics in Cells and Tissues Using Chamber- and Plate-Based Respirometers

Published on: October 26, 2021

Respiration in the open ocean.

Paul A del Giorgio1, Carlos M Duarte

  • 1Départment des sciences biologiques, Université du Québec à Montréal, CP 8888, succ Centre Ville, Montréal, Québec H3C 3P8, Canada. del_giorgio.paul@uqam.ca

Nature
|December 3, 2002
PubMed
Summary
This summary is machine-generated.

Oceans

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Area of Science:

  • Oceanography
  • Marine Biology
  • Biogeochemistry

Background:

  • The global carbon cycle is a critical area of study.
  • Understanding the ocean's role as a carbon sink or source is essential.
  • Biological respiration plays a key role in the ocean's carbon balance.

Purpose of the Study:

  • To investigate whether the oceans act as a net source or sink of carbon.
  • To compare estimates of organic matter production with biological respiration in the oceans.

Main Methods:

  • Reviewing existing estimates of respiration in different ocean layers (surface, mesopelagic, abyssal).
  • Comparing these respiration estimates with data on particulate organic matter production.

Main Results:

  • Estimates of ocean respiration are available for various regions and depths.
  • Total open ocean respiration may be significantly underestimated by current models.
  • Respiration appears to be greater than estimated organic matter production.

Conclusions:

  • The net role of the ocean biota as a carbon source or sink remains uncertain.
  • Further research is needed to accurately quantify ocean respiration and its impact on the carbon cycle.