the brain

wire

muscle

nerve

electrical impulses

proteins

hormonal

telegraph

100 miles per hour

150 meters per second

1 foot per second

1 meter per second

brains

all of the above

spinal cord

a nerve

they help carry oxygen to different parts of your body

they do not have a nucleus

they are very long compared to other cells in the body

they regenerate very quickly

Purkinje neurons

pyramidal neurons

multipolar neurons

bipolar neurons

muscle cells

stem cells

glial cells

prison cells

1 month

10 years

1 year

100 years

liver cells

muscle cells

stem cells

skin cells