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Some solutes pass readily through the lipid bilayer of a cell membrane, whereas others pass through much more slowly, or not at all These long, carbon tails are hydrophobic, so the cell membrane core is hydrophobic (water or the polar/charged molecules cannot easily pass through). • small nonpolar (hydrophobic) molecules, such as dissolved gases (o2, co2, n2) and small lipids, can pass directly through the membrane.
Oxygen (o 2) diffuses into cells because it is more concentrated outside of the cell, and carbon dioxide (co 2) diffuses out of the cell because it is more concentrated inside The core of a lipid bilayer is the location of the fatty acids tails These are both examples of passive diffusion because no energy is required.
Hydrophobic tails face inward and hydrophilic heads face outward
If you get these two ends mixed up, think of the root word “phobia” which means “fear.” hydrophobic tails fear the water, so they will always try to be as far as possible from the water solutions in and out of the cell. The phospholipids of membranes are both hydrophobic and hydrophobic molecules Small, nonpolar molecules easily pass through the phospholipid bilayer because the molecules can dissolve in the hydrophobic portion if the bilayer. They align so that the phosphate heads face water and the fatty acid tails hide inside the membrane.
This characteristic is vital to the structure of a plasma membrane because, in water, phospholipids tend to become arranged with their hydrophobic tails facing each other and their hydrophilic heads facing out. This feature is crucial for the structural properties of lipids, influencing their behavior in biological systems, particularly in forming membranes and micelles, where they interact with aqueous environments. A cell membrane is a thin covering that surrounds every living cell It functions as a barrier, keeping cell constituents in and unwanted substances out, and as a gate, allowing transport into the cell of essential nutrients and movement from the cell of waste products.
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