GENERAL ANATOMY
RESPIRATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Pass through holes in the alveoli
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Be bonded to hydrogen molecules to pass through the alveoli
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Pass through a selectively permeable membrane
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Be large enough for the body to recognize it, so that a port opens up which allows it to pass through the membrane
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Detailed explanation-1: -Oxygen diffuses through the cell membrane and is transported in blood plasma by free diffusion and by convection.
Detailed explanation-2: -In simple diffusion, small noncharged molecules or lipid soluble molecules pass between the phospholipids to enter or leave the cell, moving from areas of high concentration to areas of low concentration (they move down their concentration gradient).
Detailed explanation-3: -The simplest mechanism by which molecules can cross the plasma membrane is passive diffusion. During passive diffusion, a molecule simply dissolves in the phospholipid bilayer, diffuses across it, and then dissolves in the aqueous solution at the other side of the membrane.
Detailed explanation-4: -The walls of the alveoli share a membrane with the capillaries. That’s how close they are. This lets oxygen and carbon dioxide diffuse, or move freely, between the respiratory system and the bloodstream. Oxygen molecules attach to red blood cells, which travel back to the heart.