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Too little water in the cell will cause the cell to shrink - the percentage of water is lower outside the cell than inside the cell...which environment is described?
hypertonic
Too much water in the cell will cause the cell to burst - the percentage of water is higher outside the cell than inside the cell... which environment is described?
hypotonic
The process that brings food or oxygen to the cell is...
endocytosis
What would happen to an animal cell with an internal salt concentration of 0.3% if it were placed in a solution with a salt concentration of 0.9%?
plasmolysis (cell shrinking) because water would leave the cell
Active transport requires ____ while, passive transport does not.
energy
A contractile vacuole is used to remove excess water in a ____ organism.
unicellular
The process that removes wastes from the cell is...
exocytosis
In diffusion, once the molecules are evenly distributed within a given area, a state of ____ is reached.
equilibrium
What environment will cause water to move in and out of a red blood cell equally?
isotonic
If a red blood cell is placed in a hypotonic environment the water will move ____ the red blood cell.
into
If a red blood cell is placed in a hypertonic environment the water will move ____ the red blood cell.
out of
Osmosis causes ____ pressure in plants to provide strength/support and prevent them from wilting.
turgor
Osmosis occurs through a ____ membrane.
semipermeable
Substances diffuse passively from a ____ to _____ concentration.
high to low
How could your body maintain homeostasis when your temperature reaches a cool 97.5 degrees (F)?
shivering
Which part of the cell membrane allows substances like calcium ions to cross?
protein channels
A large molecule that can't cross the phospholipid bilayer but can cross the membrane passively does so by ____ diffusion, requiring membrane proteins.
facilitated
Since water is repelled by the ____ tails of the phospholipid, the phospholipid bilayer is only partially permeable to water.
hydrophobic
____ pumps help transport materials from one side of the cell membrane to the other.
protein
Give an example of maintaining homeostasis.
ex) deer seeking salty foods to add to its diet; turtle sitting for hours on a sunny rock; jogger stops to drink water
Large molecules sometimes enter the cell by way of an...
involution
When the concentration of molecules on both sides of the membrane is the same during diffusion, do the molecules ever stop moving across the membrane?
NO
A(n) ____ environment leads to homeostasis.
isotonic
Large, solid ____ particles are brought into the cell actively by phagocytosis.
food
____ occurs because molecules constantly move and collide with one another.
diffusion
Small molecules can pass from one side of the membrane to the other by going between the ____ molecules.
phospholipid
Your fingers shrivel up when you swim in the ocean because you are in a ____ environment.
hypertonic
What regulates the movement of materials into and out of the cell?
cell membrane
____ is the relatively constant internal physical conditions of an organism.
homeostasis
The diffusion of water across a semipermeable membrane...
osmosis
What can enter the cell actively through pinocytosis?
fluids/liquids
A hypertonic environment will eventually lead to ____ or ____ when the cell shrinks.
plasmolysis; crenation
A ____ environment can lead to cytolysis (cell bursting).
hypotonic
This means of particle transport requires ENERGY from the cell...
active transport
Each cell must maintain homeostasis in ____ organisms.
multicellular


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