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Cells consist of three parts: the
plasma membrane, cytoplasm
and
nucleus
.
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Substances pass through the plasma membrane by
diffusion
(gases, lipids),
osmosis
(water),
active transport
(glucose, ions),
phagocytosis
(particles),
pinocytosis
(fluids) and
exocytosis
(particles and fluids).
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Osmosis
is the diffusion of
water
through a
semipermeable membrane
. Water diffuses from high water "concentration" to low water "concentration".
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The cytoplasm consists of
cytosol
in which are suspended
cell inclusions
and
organelles
.
-
organelles include
ribosomes, endoplasmic reticulum, mitochondria, Golgi bodies
and
lysosomes
.
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The
nucleus
controls the activity of the cell. It contains the
chromosomes
that are composed of
DNA
.
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The cell divides by
mitosis
and
meiosis