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cell membrane/transport
formation of cell membrane and types of transport through membrane
18
Anatomy
Undergraduate 1
11/10/2015

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Term
phospholipids
Definition
polar (hydrophilic) head and nonpolar (hydrophobic) tails
Term
phospholipid bilayer
Definition
polar heads face fluid and nonpolar tails face each other, creating the basis for membranes
Term
cholesterol
Definition
always in membrane, creates rigidity
Term
proteins
Definition
can be embedded in membrane
Term
carbohydrates
Definition
identify the cell, often are on external of cell
Term
permeability
Definition
ability for certain things to go through the membrane
Term
active transport
Definition
using energy
Term
passive transport
Definition
without using energy
Term
types of transport
Definition
1.direct
2.channel mediated
3.Active carrier mediated
4.Passive carrier mediated
5.vesicular
Term
diffusion
Definition
direct transport, creating an equal concentration gradient, small lipids and gases move from high to low
Term
osmosis
Definition
diffusion of water from high to low (direct transport)
Term
isotonic
Definition
concentration is equal inside and outside of cell
Term
hypotonic
Definition
concentration is greater outside cell than in, water moves in, cell swells
Term
hypertonic
Definition
concentration is greater inside cell than out, water moves out, cell crenates.
Term
ion pumps
Definition
active, needs energy! ignores concentration gradients
Term
vesicular transport
Definition
packages things in vesicles (membranes)
active!!
Term
endocytosis
Definition
going into cell
phagocytosis
pinocytosis
Term
exocytosis
Definition
exiting the cell
cytokines
hormones
waste products
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