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Lesson Overview
Homeostasis and Cells
Lesson Overview
7.4 Homeostasis and Cells
Lesson Overview
Homeostasis and Cells
The Cell as an Organism
Multicellular and unicellular organisms
must achieve homeostasis, relatively
constant internal physical and chemical
conditions.
Lesson Overview
Homeostasis and Cells
The Cell as an Organism
In terms of their numbers, unicellular organisms dominate life
on Earth.
Unicellular organisms include both prokaryotes and
eukaryotes.
Lesson Overview
Homeostasis and Cells
Multicellular Life
The cells of multicellular organisms are interdependent.
Cells in a multicellular organism become specialized for
particular tasks and communicate with one another in
order to maintain homeostasis.
Lesson Overview
Homeostasis and Cells
Levels of Organization
The specialized cells of multicellular organisms are
organized into tissues, then into organs, and finally
into organ systems.
Lesson Overview
Homeostasis and Cells
Cell Membrane
Lesson Overview
Homeostasis and Cells
Cellular Communication
Cells use chemical
signals to control the rate
of activity and action of
the cell.
Allows the cell to hold
together with other cells
and send signals to one
another.