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Related Concept Videos

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...
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.
Alveoli and Alveolar Ducts01:26

Alveoli and Alveolar Ducts

The respiratory zone of the human body, which stands in contrast to the conducting zone, comprises the structures that actively participate in the exchange of gases. The initiation of this zone is marked by the terminal bronchioles converging into respiratory bronchioles, the tiniest bronchiole classification. The respiratory bronchioles give way to the alveolar ducts that opens into a congregation of alveoli. Actively involved in gas exchange, alveoli resemble tiny sacs similar to clusters of...
Fruit Development, Structure, and Function01:58

Fruit Development, Structure, and Function

Fruits form from a mature flower ovary. As seeds develop from the ovules contained within, the ovary wall undergoes a series of complex changes to form fruit. In some fruits, such as soybeans, the ovary wall dries; in other fruits, such as grapes, it remains fleshy. In some cases, organs other than the ovary contribute to fruit formation; such fruits are called accessory fruits.
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...
Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models00:57

Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models

Physiological pharmacokinetic models, often called flow-limited or perfusion models, typically assume a swift drug distribution between tissue and venous blood, creating a rapid drug equilibrium. This premise is based on the idea that drug diffusion is extremely fast, and the cell membrane presents no barrier to drug permeation. In this scenario, where no drug binding occurs, the drug concentration in the tissue equals that of the venous blood leaving the tissue. This greatly simplifies the...

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A three-dimensional multiscale model for gas exchange in fruit.

Quang Tri Ho1, Pieter Verboven, Bert E Verlinden

  • 1Flanders Center of Postharvest Technology, BIOSYST-MeBioS, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium.

Plant Physiology
|January 13, 2011
PubMed
Summary

Plant organ respiration relies on oxygen (O2) availability. A multiscale model accurately predicts gas exchange and cell metabolism during hypoxia and anoxia, crucial for understanding plant responses.

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Area of Science:

  • Plant Physiology
  • Biophysics
  • Computational Biology

Background:

  • Plant organ respiration is oxygen-dependent, often following Michaelis-Menten kinetics.
  • Understanding gas exchange in bulky organs like roots and fruits is vital for plant survival under stress.

Purpose of the Study:

  • To develop and validate a multiscale model for calculating gas exchange in plant organs.
  • To analyze cell metabolism during hypoxia and anoxia using microscale tissue geometry.

Main Methods:

  • A multiscale modeling approach was used to simulate gas exchange.
  • Model predictions of oxygen (O2) and carbon dioxide (CO2) partial pressures were compared with experimental data.

Main Results:

  • The multiscale model accurately predicted O2 and CO2 profiles, validating its use.
  • Intercellular spaces are the primary O2 diffusion route, while cells also transport CO2.
  • Microscale geometry significantly impacts gas exchange, with steeper gradients within cells.

Conclusions:

  • The multiscale model provides a computationally feasible method for analyzing plant organ metabolism under varying O2 conditions.
  • Microstructure, including cell and air space connectivity, is critical for accurate cellular metabolism analysis.
  • Understanding plant O2 response requires integrating external conditions, tissue properties, respiration kinetics, and microstructural details.