messageds = new Array()
messageds[0] = null;
messageds[1] = "Mitochondrion:
releases the energy from
nutrients, fuelling the cell's
life processes."
messageds[2] = "Cell membrane:
a selective barrier, through
which substances pass in and
out of the cell."
messageds[3] = "Lyosomes:
break down nutrients, toxins
(poisons), and worn-out
organelles."
messageds[4] = "Golgi body:
where cell products are
packaged in membrane
bags, before leaving the cell."
messageds[5] = "Vesicles:
bubbles of membrane around
particles that the cell
has taken in "
messageds[6] = "Cytoplasm:
the pale, fluid part of
the cell."
messageds[7] = "Ribosmoes:
where proteins are
assembled from amino
acids."
messageds[8] = "Nucleolus:
where sub-units of
ribosomes are made."
messageds[9] = "Nucleus:
the cell's control centre
it contains genes."
messageds[10] = "Endoplasmic reticulum:
where cell products are
assembled and transported."
messageds[24] = "The Cell
A cell is a highly organized
unit. Just as your body as a
whole has important organs
that carry out specific tasks,
each cell also has individual
parts-called organelles-for
different functions. The most
important organelle is the
nucleus. This is the control
centre for all that goes on in
the cell. Another type of
organelle, a sausage-shaped
structure called a
metochondrion, is like a
power station. It transforms
nutrients from food into energy
that the cell can use. The
cell's outer boundary, called
the membrane, regulates the
flow of substances into and
out of the cell by processes
such as osmosis (p. 28).
Inside the cell, many
substances move around by a
spreading-out process called
diffusion (opposite)."