Download The Cell In Its Environment

* GPS: S7L2 Students will describe the structure and function
of cells, tissues, organs, and organ systems.
a.Explain that cells take in nutrients in order to grow and
divide to make needed materials.
b.Relate cell structures (cell membrane, nucleus, cytoplasm,
chloroplast, and mitochondria) to basic cell functions
* Explain that cells are organized into tissues, tissues into
organs, organs into systems, and systems into organisms
*
* selectively permeable- some substances can pass
through the membrane while others cannot
* diffusion- the process by which molecules move
from an area of higher concentration to an area of
low concentration
* osmosis- the diffusion of water molecules through
a selectively permeable membrane
* passive transport- the movement of dissolved
materials through a cell membrane without using
cellular energy
* active transport- the movement of materials
through a cell membrane using cellular energy
* endocytosis- the process in which a cell membrane
surrounds a particle and encloses it in a vesicle to
bring it into the cell
* exocytosis- the process used to remove large
particles from a cell
selectively permeablesome substances can pass
through the membrane while
others cannot
diffusion- the process
by which molecules
move from an area of
higher concentration to
an area of low
concentration
osmosis- the diffusion of
water molecules through a
selectively permeable
membrane
passive transport- the
movement of dissolved
materials through a cell
membrane without
using cellular energy
active transportthe movement of
materials through a
cell membrane using
cellular energy
endocytosis- the process
in which a cell membrane
surrounds a particle and
encloses it in a vesicle to
bring it into the cell
exocytosis- the
process used to
remove large
particles from a cell
*
• Diffusion is the process by which
molecules move from an area of high
concentration to low concentration.
• Diffusion is the main method that
molecules move across the cell membrane.
• Diffusion is caused because molecules are
always moving.
• Molecules are bump into each other and
cause them to spread.
• Osmosis is the diffusion of water
molecules through a selectively permeable
membrane.
• Because cells cannot function properly
without water, many cellular processes
depend on osmosis.
• Osmosis moves water molecules by the
process of diffusion.
• Osmosis keeps cells with their shape.
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Passive transport does NOT require using
cellular energy to move material through a
cellular membrane.
Active transport requires the cell to use its own
energy while moving through the cellular
membrane.
In active transport proteins get “picked up”
outside the cell and carried inside the cell.
When cell remove large particle from inside the
outside the cell this is called exocytosis.
Another method of active transport is engulfing.
This is also known as endocytosis because it
happens inside the cell.
During engulfing the cell membrane surrounds a
particle and forms a vacuole within the cell.