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Eukaryotic cells are organised around systems of membranes
Cells are surrounded Plasma Membrane
by a plasma membrane
Cytosol
within which is
contained a complex The plasma
fluid called the membrane serves
cytosol as a boundary
between the cell
Suspended in the and its
cytosol are numerous environment
specialised
membrane-bound It retains the cell
structures called as a unit and, due
organelles to its partial
permeability,
The cytosol regulates the
together with the movement of
organelles materials into and
make up the out of the cell
cytoplasm
Plasma membranes vary in thickness between
7.5 and 10 nm (nanometres - 10-9 m)…read more

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Eukaryotic cells are organised around systems of membranes
Microvilli Plasma Membrane
The plasma membranes
of animals cells Cytosol
are often highly At
folded and form magnifications
of around
microvilli 250 000,
membranes are
Microvilli increase seen to have a
the surface area three-layered
available for the structure
exchange of materials
Membranes are
composed primarily
of phospholipid and Three -
protein molecules layered
structure
Plasma membranes vary in thickness between
7.5 and 10 nm (nanometres - 10-9 m)…read more

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cytosol extra-
cellular
fluid
magnify
The three-layered structure is seen as
two thin dense outer layers surrounding
a thicker but less dense middle region three-layered membrane
structure…read more

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Animal cells, with The nucleus contains the hereditary material
the exception of in the form of chromatin in non-dividing cells
mammalian red blood
Chromatin appears
cells, possess a nucleus as granular material
The nucleus is a in the nucleoplasm
large spherical or During cell
division chromatin
oval organelle condenses into
surrounded by a more tightly
double membrane coiled threads
called
called the chromosomes
nuclear envelope Nuclear Envelope
The nuclear envelope Nuclear Pore
is perforated by
nuclear pores Nucleoplasm
The fluid contained
The Nucleolus is
within the nucleus
a small densely
is called
staining disc within
nucleoplasm
the nucleus
The nucleus contains the hereditary material and
controls the activities of the cell…read more

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Chromatin - granular Nuclear Envelope
appearance of the (double membrane)
hereditary material
in non-dividing cells Nuclear pore
Nucleoplasm
Coiled and
condensed chromatin
forms distinctive
thread-like
chromosomes during
cell division Nucleolus
DNA is the material of heredity. DNA associated with histone protein
molecules forms the chromatin of the non-dividing cell…read more

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