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How Various Mechanisms By Which Substances Cross The Cell Me - College Essay

How Various Mechanisms By Which Substances Cross The Cell Me


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 active transport the traffic
through the cell membrane is regulated.
Diffusion is the movement of molecules form one area of higher
concentration to an area of lower concentration. Concentration gradient
causes the molecules ...

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is greater than the
molecules will travel from the higher to lower concentration.
Eventually there will be a dynamic equilibrium and there will be no net
movement of molecules from one side to the other.
Osmosis is the diffusion of water. Like diffusion, the water moves
from a region of higher water potential to a region of lower water
potential. Solutions have three different stages that the solutes can
be classified in: isotonic, hypertonic, and hypotonic. Isotonic is when
the solutions have equal amounts of solutes. Like equilibrium, there is
no net change in the amount of water in either solution. When the
solutions have different concentration of solutes then the one with less
solute is hypotonic and the one with more solute is hypertonic.
Hypotonic takes in the solute from the hypertonic side that gives away
the solute. There will be a net movement in these types of solution.
The molecules will move from the hypotonic solution into the hypertonic
...

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PAPER DETAILS
Added: 3/3/2004 07:27:00 PM
Category: Science & Nature
Type: Free Paper
Words: 886
Pages: 4

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