Page 12 - All about cells - FULL
P. 12
L
O
C
Some cells are single, self-sustaining organisms, such as amoebas and bacteria. Other cells
are part of multicellular organisms and cannot survive alone.
One-Celled Organism - Amoeba pseudopod nucleus food
vacuole
A one-celled organism, such as an
amoeba, is able to perform all of its life
functions by itself.
cell
membrane
contractile
vacuole cytoplasm
Cell Tissues
In multicellular organisms, cells depend on each other and are organized into tissues that
perform a specific job.
muscle cell
muscle tissue
organ (heart)
Organs and Organ Systems
These tissues are further organized into organs and organ systems
that work together to keep an organism alive.
circulatory system
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