Ch. 22 The Respiratory System

Marieb - Human Anatomy & Physiology 11th Edition

Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034Non è quello che usi tu?Cambia libro di testo

Marieb, Hoehn 11th Edition

Ch. 22 The Respiratory System

Problema 8

Capitolo 22, Problema 8

Oxygen and carbon dioxide are exchanged in the lungs and through all cell membranes by:
a. Active transport
b. Diffusion
c. Filtration
d. Osmosis

Guida verificata passo dopo passo

Understand the process of gas exchange in the lungs and across cell membranes, which involves the movement of oxygen and carbon dioxide molecules between areas of different concentrations.

Recall that active transport requires energy to move substances against their concentration gradient, which is not typical for gases like oxygen and carbon dioxide during exchange.

Consider diffusion, which is the passive movement of molecules from an area of higher concentration to an area of lower concentration, a process that fits how gases move in the lungs and cells.

Evaluate filtration, which involves the movement of water and solutes through a membrane due to pressure differences, generally not applicable to gas exchange.

Review osmosis, which specifically refers to the movement of water across a semipermeable membrane, and is not the mechanism for gas exchange.

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Diffusion

Diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration. In the lungs and across cell membranes, oxygen and carbon dioxide move by diffusion, allowing gas exchange without energy expenditure.

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Percorso guidato

02:44

Diffusion

Active Transport

Active transport is the energy-dependent process where molecules move against their concentration gradient using cellular energy (ATP). It is not typically involved in the exchange of gases like oxygen and carbon dioxide in the lungs.

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Percorso guidato

02:37

Active Transport

Osmosis and Filtration

Osmosis is the diffusion of water across a semipermeable membrane, while filtration involves movement of fluids through membranes driven by pressure differences. Neither process primarily facilitates gas exchange in the lungs or cells.

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Percorso guidato

05:59

Osmosis

Pratica correlata

Domanda del libro di testo

In mouth-to-mouth artificial respiration, the rescuer blows air from his or her own respiratory system into that of the victim. Which of the following statements are correct?

(1) Expansion of the victim's lungs is brought about by blowing air in at higher than atmospheric pressure (positive-pressure breathing).

(2) During inflation of the lungs, the intrapleural pressure increases.

(3) This technique will not work if the victim has a hole in the chest wall, even if the lungs are intact.

(4) Expiration during this procedure depends on the elasticity of the alveolar and thoracic walls.

a. All of these

b. 1, 2, 4

c. 1, 2, 3

d. 1, 4

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Domanda del libro di testo

When the inspiratory muscles contract: