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Movement of Substances Through Cell Membranes
Anatomy & Physiology
15
Physiology
11th Grade
10/07/2013

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Term

Passive Transport

Definition
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transport of a substance across a cell membrane by diffusion; expenditure of energy is not required
Term
Diffusion
Definition
a type of passive transport, therefore, it is a net movement of molecules in and out of the cell across the cell membrane along a concentration gradient.
Term

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Simple Diffusion

Definition
the net movement of particles from a region of higher concentration to a region of lower concentration below a concentration gradient
Term
Osmosis
Definition

the process that causes a liquid (especially water) to pass through the wall of a living cell

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Term
Facilitaded Diffusion
Definition
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Term
Channel-Mediated Passive Transport
Definition
channels are specific, only allows one type of solute to pass through.   Gated channels may be open or closed (inactive), and may be triggered by any of a variety of stimuli.   Channels allow membranes to be selectively permeable.   Aquaporins are water channels that permit rapid osmosis.
Term
Carrie-mediated passive transport.
Definition
Carriers attract and bind to the solute, change shape and release the solute on the other side of the carrier.   Carriers are usually reversible depending on the direction of the concentration gradient.
Term
Active Transport
Definition

 movement of all types of molecules across a cell membrane against its concentration gradient (from low to high concentration

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Term
Transport by Pumps
Definition
Pumps are membrane transporters that move a substance against their concentration gradient, opposite of diffusion.
Term
Transport by vesicles
Definition
Allows substances to enter or leave the interior of a cell without moving through its plasma membrane.
Term
Endocytosis
Definition
The plasma membrane "traps" some extracellular material and brings it into the cell in a vesicle. [image]
Term
Phagocytosis "condition of cell eating"
Definition
large particels are engulfed by the plasma membrane and enter the cell in vesicles. The vesicles fuse with lysosomes, which digest the particles.
Term
Pinocytosis "condition of cell drinking"
Definition
fluid and the substances dissolved in it enter the cell.
Term
Receptor-mediated endocytosis
Definition
membrane receptor molecules recognize substances to be brought in the cell.
Term
Exocytosis
Definition
Process by which large molecules, notable proteins can leave the cell even though they are too large to move out through the plasma membrane.   Large molecules are enclosed in membranous vesicles and then pulled to the plasma membrane by the cytoskeleton, where the contents are release.   exocytosis also provides a way for new material to be added to the plasma membrane. [image]
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