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Cellular Transport

Cell Transport
by

Shiley Biology

on 16 October 2013

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Transcript of Cellular Transport

Passive transport
So What?
We need Homeostasis to live
Homeostasis
The ability of an organism to maintain a constant or stable environment

All organisms have processes that respond to stimuli in order to keep the conditions in their bodies in equilibrium.
The cell membrane lets stuff in and out to keep the body balanced
The net movement of the particles of a substance from where they are more concentrated to where they are less concentrated, creating a balanced concentrated area.
a concentration gradient is established as an area becomes unbalanced
Molecules can pass through the membrane freely, Molecules moving in one direction is equal to the number moving in the other direction.
Osmosis
Facilitated Diffusion
process where substances are helped through the cell membrane by
transport proteins

Active Transport
Transport Protein
Pumps
a kind of protein that is capable of pumping molecules through the cell membrane

by using this process, cells can form a concentrated area of molecules inside a cell or can remove waste from a cell
Calcium, Potassium, and Sodium ions are molecules that must be pumped across a cell membrane by active transport


Bulk Transport
the movement of large quantities of materials into or out of cells
Endocytosis
Takes material into the cell within vesicles that move inward from the plasma membrane.
Exocytosis
a process where substances move across a cell membrane and do NOT require energy from the cell
shivering when cold produces heat in the skeletal muscles and warms the body
sweating when hot cools down the body
Diffusion
high
low
concentration gradient
adding more?
where does the arrow point?
the diffusion of
water molecules
through a selectively permeable membrane from an area of high concentration to low concentration.
Osmosis is a
passive
process because it does not _____________ __________!
vocabulary

hypotonic- "under" describes water concentration that is greater outside of the cell than inside, so water moves into the cell

isotonic- "same" describes water concentration that is the same or equal inside and outside of the cell, so there is no net movement of water

hypertonic- "over" describes water concentration that is less outside of the cell than inside the cell, so water moves out of the cell
lysed cell
Because the amount of water molecules is less on the outside of the cell than on the inside of the cell, the molecules will move through the membrane to the area where less water molecules are.
why is this happening?!
animal, blood cell
plant cell
Facilitated diffusion is a
passive
process because it does not _____________ __________!
Why?

some substances have chemical structures that prevent them from passing through the cell membrane.
molecules move against the concentration gradient
from an area of low concentration to an area of high concentration
requires the cell to expend energy.
vesicles, filled with large molecules, from inside the cell move outward to the plasma membrane
add tim and moby video
Full transcript