proteins

hormonal

electrical impulses

telegraph

100 years

1 year

1 month

10 years

1 foot per second

100 miles per hour

150 meters per second

1 meter per second

they do not have a nucleus

they help carry oxygen to different parts of your body

they regenerate very quickly

they are very long compared to other cells in the body

skin cells

liver cells

muscle cells

stem cells

muscle cells

glial cells

prison cells

stem cells

spinal cord

a nerve

brains

all of the above

bipolar neurons

Purkinje neurons

pyramidal neurons

multipolar neurons

the brain

wire

muscle

nerve