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Biology Chapter 5
A vocab study
21
Science
10th Grade
10/25/2009

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Term
Brownian Movement
Definition
Small particles constantly moving or "jiggling"
Term
Diffusion
Definition
movement from high concentration to an area of low concentration
Term
exocytosis
Definition
cell release large molecules from the cell
Term
phagocytosis
Definition
specific type of endocytosis that takes in solid particles
Term
pinocytosis
Definition
specific type of endocytosis that takes in liquid particles
Term
osmosis
Definition
movement of water molecules from higher concentration to lower concentration
Term
permeable
Definition
osmosis takes place across this kind of membrane
Term
selectively permeable
Definition
The cells membrane is _______ which only allows certain types of molecules to enter or leave the cell
Term
cytoplasm
Definition
contains 1% dissolved solutes and 99% water
Term
hypotonic
Definition
the cell swells and possibly explodes
Term
hypertonic
Definition
cell shrinks
Term
isotonic
Definition
water on the outside and inside of cell are the same
Term
contractile vacuole
Definition
organelle that removes water
Term
turgor pressure
Definition
water pressure against a cell wall is termed
Term
cell wall
Definition
plants use this structure to act against water pressure
Term
facilitated diffusion
Definition
type of movement that doesn't require any type of energy
Term
specific , passive
Definition
the two essential characteristics of facilitated diffusion
Term
active transport
Definition
molecules move against the gradient
Term
sodium/potassium pump
Definition
term used for the active transport of sodium and potassium
Term
cells take large molecules into the cell
Definition
ednocytosis
Term
compare and contrast active transport and facilitated diffusion
Definition
active transport requires energy to move molecules from lower concentration to higher concentration- also called sodium,potassium pump- uses transport proteins, facilitated difusion does not require energy to move molecules across memrane from higher concentration to lower concentration also uses transport proteins
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