What are
cells?
What are cells?




Building blocks of living things
Let’s name some living
things:
 people, plants, animals,
bacteria
Cells provide structure,
convert nutrients to energy,
and carry out specialized
functions.
Your body is made of trillions
of cells. Muscle cells help
you move, stomach cells
help you digest your lunch,
and skin cells cover your
whole body!
Cell Structure
What do cells look like?
Animal cells
Plant cells
http://www.glogster.com/amsgirl/shrock1-plant-animal-cell/g-6lunn7f8fjsc4kg7g50nsa0
Cell Structure
What do cells look like?
Animal cells
Plant cells
• Let’s make our own cell models!
http://www.oncoursesystems.com/school/webpage/10845583/7883070
Video
Making animal cell and plant cell
models
https://www.youtube.com/watch?v=IDX9JOUskuA
Transport
How can stuff get in and out
of cells?
Passive
 Oxygen,
carbon dioxide
and water pass through tiny
holes in the cell membrane
from high concentration to
lower concentration
 Called diffusion for gases,
or osmosis for water
 Let’s explore diffusion!
http://www.biology4kids.com/files/cell2_passivetran.html
Video
Diffusion through a cell membrane
Remember, an egg is a really big single cell!
https://www.youtube.com/watch?v=rFls3g8v6fo
Transport
How can stuff get in and out
of cells?
Active



Larger molecules
need help to pass
through the cell
membrane
They can move one
molecule at a time,
or in bigger chunks
Requires energy
http://www.biology4kids.com/files/cell2_activetran.html
http://www.sophia.org/concepts/endocytosis-
Movement
How can cells move?
 Some



crawl (video 1 video 2)
make new attachments at the front
release attachments from the back
contract cell body to bring cell forward
 Let’s
explore how cells move by playing with toy
water snakes!
https://www.youtube.com/watch?v=JnlULOjUhSQ
http://www.microscopyu.com/moviegallery/livecellim
Video
How can cells move?
 Some
swim (video 1
video 2)

Cilia or flagella on cell
body move back and
forth or around like a
propeller to produce
movement
 Can
you think of other
ways cells might move?
https://www.youtube.com/watch?v=HXcEACQv5-8
https://www.youtube.com/watch?v=jl0TzaWUQWk
Video
Can you think of things other than
cells that move in similar ways?
Let’s cell-ebrate what we’ve
learned!
We know…
 the parts of the cell
 how water and
other materials
move in and out of
cells
 how cells move