A cell membrane has a miad composition of lipids and proteins
Adhesion Proteins
help cells of the same type locate each other and remain in the proper tissue
Communication Proteins
form channels that match up across the plasma membrames of two cells
Receptor Proteins
bind extracellular substance ,such as hormones , that can trigger change in cell activities
Recognition Proteins
that are unique identity tags for each species
Passive Transporter
have a channel throught their
Active Transporter
movement with pump them throught
Concentration Gradient
is a difference in the number per unit volume of molecules of a substance between two adjaining regions
Diffusion
is the name for the net movementof like molecules or ions down a concentartion gradient
Electric Gradient
is simply a difference in electric charge between adjaining regions
Pressure Gradient
is a difference in pressure exterd per unit volume between two adjaining regions
Hypotonic Solution
is the one with fewer solute
Hypertonic Solution
the one having more solutes
Isolotonic Solution
show no net osmotic movement
Osmatic pressure
one measure of the tendence of water to follow its water
Endocytosis
a small patch of plasma membrane
Exocytosis
a vesicles moves to the cells surface
Phagocytosis
is a common endocytic pathway
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