CE
STRUC
SEELEY'S ESSENTIALS
, CELL STR
The cell is the basic livin
CELL
The simplest organisms consist of single
cells, whereas humans are composed of
multiple cells.
An average-sized cell is one-fifth the size
of the smallest dot you can make on a
sheet of paper with a sharp pencil!
Cell was discovered in late 1600’s by
Robert Hooke through dead plant.
Cells was named after the long rows of
monk’s rooms (or cells) at the monastery.
, CELL STR
FUNCTIONS O
Cells are the smallest units that have all the
perform several important functions:
Cell metabolism and energy use.
The chemical reactions that occur with
metabolism. Energy released during m
the synthesis of new molecules, muscle
helps maintain body temperature.
Synthesis of molecules.
Cells synthesize various types of molec
lipids. The different cells of the body d
Therefore, the structural and functiona
by the types of molecules they produce
Communication.
, CELL STR
Plasma
Membrane
Also known as CELL
MEMBRANE.
The outermost component of
a cell.
A fragile, transparent barrier
that contains the cell
contents and separates them
from the surrounding
environment.