Transcript cell - Exploration Works

Cells
Cell
 is the basic
building block
that makes up all
living things
Cell Functions
 Take in food to store energy
 Get rid of body wastes
 Make new cells for growth
 Release energy
 Respond to the environment
Plant Cell
cell membrane
chloroplasts
cell wall
vacuole
mitochondria
cytoplasm
nucleus
Animal Cell
VACUOLE
MITOCHONDRIA
Cell MEMBRANE
NUCLEUS
CYTOPLASM
Cell Parts and Functions
Cell Membrane
 Surrounds the cell
to help hold it
together
 Allows materials to
move in and out
 Works like a gate in a
walled city
PICTURE OF A REAL CELL MEMBRANE
 It has been magnified so that we can see it!
Nucleus
 Contains the
chromosomes
(DNA) which
determines the
characteristics
 Controls cell
reproduction and
other functions
 Like a king controlling
his city
Nucleus seen in a human cheek cell
Cytoplasm
 Found between the
cell membrane and
nucleus
 Jellylike substance
containing
chemicals to keep
the cell working
 Like the space/air that
fills the walled city
Mitochondria
 Releases energy
from food
 Like a power plant
producing energy for the
city
Vacuoles
 Used for storage
 Stores food, waste,
or water
 Like a water tower or a
garbage dump for the
city
Cell Wall (Plants Only)
 Outside cell
membrane
 Rigid layer that
supports and
protects the plant
cell
 Like a wall surrounding
the city
 The cell walls of these onion
skin cells can be seen in the
photograph below.
Chloroplasts (Plants Only)
 Makes food for the plant
 Like a restaurant or
cell
 Uses sun energy to make
food (glucose) and
oxygen
bakery in the city
An Elodea leaf magnified 400X.
The numerous green structures are
chloroplasts.
The Parts of a Cell
 Cell Membrane
 Cytoplasm
 Chloroplast
 Cell Wall
 Vacuole
 Mitochondria
 Nucleus
The Size of Cells
• Cells have a limit to how big
or small they can be.
The head of a pin is
about 2mm in diameter.
A cell is even smaller.
Nearly invisible without
magnification, dust
mites dwarf pollen
grains and human
cells. In turn, bacteria
and viruses are even
smaller.
 How Big is a Cell?
cell membrane
 surrounds cell-holds it
together
 allows materials to pass
in & out of cell
cell
basic building
block that makes
up all living
things
cytoplasm
between cell
membrane &
nucleus
chloroplast
•found in plant cells
•uses Sun’s energy to
make food (sugar) &
oxygen
cell wall
 found in plants outside
the cell membrane
 gives extra support &
protection
vacuole
stores H20 &
breaks down
materials
mitochondria
produce energy
by cellular
respiration
cytoplasm
cell membrane
mitochondria
chloroplast
cell wall
vacuole
The skin on the
Barbie doll is
like the cell
membrane of a
cell because
both are
outside
surfaces, and
allow
substances to
pass in and out
of the cell.
Cell
Analogy
Project
Edible Animal Cell
 cell membrane =
 Jello =
 2 raisins =
 1 pear
=
 2 peaches =
plastic bag
cytoplasm
mitochondria
nucleus
vacuoles