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Goal 1.2.1
Homeostasis and Cell Transport Lesson 2
16
Biology
10th Grade
03/05/2013

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Term
Homeostasis
Definition
is the maintenance of stable internal condition in a cell or organism despite changes in its environment
Term
pH
Definition
of a solution describes how acidic or basic the solution is
Term
buffer
Definition
is a substance that tends to maintain a stable pH
Term
Diffusion
Definition
is the movement of particles from an area of higher concentration to an area of lower concentration
Term
Passive Transport
Definition
The movement of materials into or out of the cell without the expenditure of energy
Term
Equilibrium
Definition
When particles reach this state of equal concentration or balance, the system is at ___
Term
Selectively Permeable
Definition
plasma membrane are __ - that is, only some kinds of particles can pass through them.
Term
Osmosis
Definition
is the movement of water molecules into a concentrated solution from a less concentrated solution -either into or out of the cell.
Term
Concentration Gradient
Definition
A difference in concentration on opposite sides of a plasma membrane makes osmosis possible the difference is called ___.
Term
Hypertonic
Definition
the concentration of a solute outside the cell is higher than the concentration in the cytoplasm
Term
Hypotonic
Definition
the concentration of solute in the cytoplasm is higher than the concentration outside the cell.
Term
Facilitated Diffusion
Definition
is the movement of substance across the plasma membrane with the aid of protein molecules embedded in the membrane
Term
Active Transport
Definition
Moving material against the concentration gradient requires energy is called ____
Term
Observation
Definition
is information gathered with the senses or measured with a tool
Term
Inference
Definition
is an explanation based on knowledge and prior experience
Term
Isotonic
Definition
Solutions with equal concentrations on both sides of a membrane are ____
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