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Cell Boundaries

good stuff
by

Jeanette Morales

on 21 October 2014

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Transcript of Cell Boundaries

Cell Boundaries
END OF SECTION
Diffusion Through Cell Boundaries
The process by which molecules diffuse across a membrane through protein channels is called
active transport.
endocytosis.
facilitated diffusion.
osmosis.
7-3

Endocytosis
is the process of taking material into the cell.
Two examples of endocytosis are:
phagocytosis
pinocytosis


Exocytosis
is the process where materials are forced out of the cell.
Active Transport
Osmosis
Water tends to move from an area with more water to an area with less water .

If you COMPARE two solutions, three terms can be used to describe the concentrations:
Osmosis
If a substance is more highly concentrated outside the cell than inside the cell and the substance can move through the cell membrane, the substance will
move by diffusion from inside the cell to outside.
remain in high concentration outside the cell.
move by diffusion from outside to inside the cell.
cause water to enter the cell by osmosis.
7-3
The concentration of a solution is defined as the
volume of solute in a given mass of solution.
mass of solute in a given volume of solution.
mass of solution in a given volume of solute.
volume of solution in a given mass of solute.
7-3
Osmosis
Diffusion 
 
Cornell Notes Diffusion across membranes

What is the main function of the
cell wall
?
Cell Walls
Cell Membrane
The
cell membrane
regulates what enters and leaves the cell and also provides protection and support.
The movement of materials in a cell against a concentration difference is called
facilitated diffusion.
active transport.
osmosis.
diffusion.
7-3
Sometimes cells move materials against a concentration difference, the opposite from diffusion.

This process is known as
active transport
.



Active transport requires energy.
Active Transport

the diffusion of water
through a selectively
permeable membrane.
Cornell Notes Osmosis

substances dissolved
in a solution.
Diffusion Through Cell Boundaries
All cells are surrounded by a thin, flexible barrier known as the
cell membrane
.

Many cells also produce a strong supporting layer around the membrane known as a
cell wall
.
7-3 Cell Boundaries
Glucose molecules
Protein channel
Facilitated Diffusion
Molecule to be carried
Active Transport
Cell walls are found in
plants
,
algae
, fungi, and many
prokaryotes
.
Cell Walls
Cell Membrane
Which organisms
have cell walls?
What do the prefixes
hyper-
,
hypo-
, and
iso-
mean?
Movement of a substance from
an area of high concentration
to an area of low concentration.
Solutes
cytoplasm inside
cells
contains solutes dissolved in water
Osmosis
Link to
Movement
of molecules
across a membrane

that does not require any energy.
.
Passive Transport:
Molecules will move

down the concentration
gradient
from high to low.
will eventually reach
equilibrium,
where molecules will be the same on each side
Equilibrium
movement of particles from an area with more particles to an area with less particles
hypertonic
means more solutes(solids), less water molecules
hypotonic
means less solutes (solids), more water molecules
isotonic
means equal amounts of solids and water molecules on both sides
Example: Red blood cells.
Water will enter or exit the cell depending on what type of solution it is placed in.
Water exits=cell shrinking
Water enters=cell expands (can burst)
movement of molecules through specialized protein channels
does not require energy
molecules will pass through channels from areas with more molecules to areas with less molecules
molecules are often too large to pass between the lipids of the membrane
Proteins found in lipid bilayer
1. Receptor Proteins
2. Recognition Proteins
3. Channel/Transport Proteins
Movement through the plasma membrane occurs in four ways:
A.
Diffusion through the lipid bilayer.
Example: substances that are lipid soluble (can dissolve in lipids) such as oxygen, carbon dioxide, and steroid hormones.
B.
Diffusion through membrane channels.
Example: substances that are water soluble and are small enough to pass through the membrane channels, e.g., water and some ions.
C.
Transport by carrier molecules.
Example: substances that are water soluble and are too large to pass through the membrane channels, e.g., glucose and amino acids.
D.
Membrane-bound sacs
called vesicles transport large water soluble molecules such as
proteins and particulate matter.
Full transcript