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How various mechanisms by which substances cross the cell membrane
Title: How various mechanisms by which substances cross the cell membrane
Category: Science & Technology
Details: Words: 890 | Pages: 3.8 (approximately 235 words/page)
How various mechanisms by which substances cross the cell membrane
Homeostasis is essential to the cell’s survival. The cell membrane is
responsible for homeostasis. The membrane has a selective permeability
which means what moves in and out of the cell is regulated. Amino
acids, sugars, oxygen, sodium, and potassium are examples of substances
that enter the cell. Waste products and carbon dioxide are removed from
the cell. All of these substances cross the membrane in a variety of
ways. From diffusion and osmosis, to …showed first 75 words of 890 total…
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…showed last 75 words of 890 total…is
hydrolyzed and the phosphate group is transferred we call it
phosphorylation.
In review, substances cross the cell membrane in two different ways:
passive and active transport. Passive transport includes osmosis,
diffusion, and facilitated diffusion. None of these techniques use
energy. Active transport includes endo and exocytosis, sodium-potassium
pumps. and phosphorylation, all of which expend energy to transport
substances across the cell membrane. The cell has the ability to
regulate what crosses its cellular boundaries.
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