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Homeostasis & Disease

Terms in this set (52)

Define Homeostasis
The process of maintaining a stable level of internal conditions.
At what level is homeostasis maintained?
In multicellular organisms, homeostasis must be maintained at both the cellular and organism level.
What do organisms have to maintain in order to stay in homeostasis?
Appropriate internal temperature, water level, food levels, etc.
How can a cell slightly alter its internal and external conditions?
By controlling what goes into and out of the cell.
What will happen if a cell or organism can not maintain homeostasis by a lot for a long time?
If a cell or organism cannot maintain homeostasis by a lot for a long time, disease would occur when homeostasis is no longer maintained, and the cell would die.
What will happen if a cell or organism can not maintain homeostasis by a small amount?
If a cell or organism cannot maintain homeostasis by a small amount, they would not die and it could alter its surroundings or internal conditions by controlling what goes into and out of the cell.
Define desease.
Occurs when homeostasis is no longer maintained.
What is a stressor?
Something that can alter the hormonal functions of a cell/organism.
Describe the movement of molecules.
Molecules never stop moving. They travel in a straight line until they hit something. This causes molecules to move into areas that are less concentrated.
What causes molecules to move into less crowded areas?
Since the molecules move in straight lines until they bump into another molecule, they eventually spread out so that they stop crashing into each other.
Define concentration
The amount of a specific solute or objects in a given area.
I think that temperature would affect diffusion by:
Hot: speed up diffusion, because particles bounce off each other faster and causes them to spread out more.
Cold: slows down diffusion, because particles bounce off each other slower and move slower in general and it causes them to spread out slower.
What is a concentration gradient?
The difference in concentration of a substance across an area.
During diffusion how many molecules move to lower concentration?
The "amount" of molecules that move to the low concentrated area equals 1/2 the concentration gradient.
What is it called when there is no concentration gradient?
Equilibrium
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