the endoplasmic reticulum is a highly
organized material consisting of solube
ground substsance called cytosol.
this contains an elaborated system of parallel, flattened
cavitites lined with a thin membrane.
smooth endoplasmic reticulum-
where the membrane has no
ribosomes present. the SER is
concerned with the synthesis and
transport of lipids.
rough endoplasmic
reticulum- where
ribosomes line the
membrane, the RER is
the site of protein
synthesis.
lysosomes
Annotations:
lysosomes- contain and isoloate digestive enzymes from the remainder of the cell.
digestion is carried out in a membrane lined vacuole into which several lysosomes may discharge their contents.
one of the functions of lysosomes is to destroy worn out organelles in the cell.
specialised vesicles because
they contain digestive enzymes
the
enzymes
have the
ability to
break down
proteins and
lipids.
if the enzymes were free
to react in the cytoplasm
then cell distruction
would result.
centrioles
in a cell there are two short cylinders
which contain microtubles.
there function is too aid in cell
division. during division they
move to opposite poles as the
spindle develops.
nucleus
this controls all of the cellular activity
using coded instructions located in DNA.
these coded
instructions enable
the cell to make
specific proteins.
RNA is produced in
the nucleus and
leaves via the
nuclear envelope.
the nuclear stores replicates and decodes DNA.
mitochondria
these consist of an outer
membrane enclosing a
semi-fluid matrix.
throughout the matrix is an internal membrane, folded
into cristae. the cristae and matrix contain enzymes which
enable this organelle to carry out aerobic respiration.
it is the key organelle in the release of energy, making ATP available to the cell.
mitochondria are needed for many energy
requiring processes in the cell, including
active transport and the movement of
cilia.