What Do Brains
They differ a lot, depending on the species.
Brains of many different species, shown to scale of
relative size. See more pictures of brains from many species by clicking
here and here.
See also Activity #1.
What Do Nerve Cells Look Like?
Diagram of a nerve cell, called a
|Nerve cells are call "neurons."
They are like all cells, except that they come in many sizes and
types. Their cell membranes form many small branches, both around
the cell body and at the ends of long extensions of the cell, called
"axons." In this diagram, the part of the cell near the
letters is the cell body, which houses the cell nucleus and most
of the organelles. Sometimes it is hard to tell which is extension
is the axon and which are just branches on the cell body.
Different types of neurons that occur in brain
and spinal cord.
What Do Neurons Do?
Electricity, chemicals, spinal cord
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