23 terms

Homeostasis2 (for Final Dec2015)

STUDY
PLAY

Terms in this set (...)

Homeostasis
The process of maintaining a stable internal body condition.
Solute
The substance that is dissolved.
Ex) salt, glucose, starch, iodine, Kool-Aid
Solvent
The substance that the solute dissolves in.
Water is called the "universal solvent" because it is so good at dissolving things.
Solution
The mixture that is created when a solute is evenly distributed within the solvent.
Ex) Glucose Solution, Starch Solution
The prefix hyper means . . .
[hint: (think of a hyperactive child; they are more active than the normal child].
Higher, more
The prefix hypo means . . .
[hint: (the hypodermis is below the dermis; these are layers of your skin)].
Below, less
The prefix iso means . . .
same
Hypertonic Solution
The concentration of solute is higher outside the cell.
Hypotonic Solution
The concentration of solute is lower outside the cell.
Isotonic Solution
The concentration of solute is equal inside and outside the cell.
Which direction will water move when a cell is placed in a hypotonic solution?
In
Which direction will water move when a cell is placed in a hypertonic solution?
Out
Which direction will water move when a cell is placed in an isotonic solution?
in and out
The movement of molecules from a high concentration to a low concentration, until equilibrium is reached
Diffusion
The diffusion of water
Osmosis
What will happen to a cell when it is placed in a hypotonic solution? (shrink, swell, remain the same?)
swell
What will happen to a cell when it is placed in a hypertonic solution? (shrink, swell, remain the same?)
shrink
What will happen to a cell when it is placed in a isotonic solution? (shrink, swell, remain the same?)
It will remain the same
Water moves in and out equally, so there is no change in the mass of the cell.
Equilibrium
The even distribution of molecules after difussion
Describe what happens to red blood cells in a hypotonic solution.
Water is moving into the cells causing them to swell. One has even exploded.
Describe what happens to red blood cells in a isotonic solution.
Water is moving in and out equally. The cells retain (keep) their normal shape.
Describe what happens to red blood cells in a hypertonic solution.
Water is moving out of the cells causing them to shrink.
Selectively permeable membrane
(a.k.a. semi-permeable)
A membrane that only allows certain substance pass through. Small molecules, like Glucose can fit through, large molecules, like starch, can not.