proteins

hormonal

electrical impulses

telegraph

150 meters per second

1 meter per second

100 miles per hour

1 foot per second

100 years

10 years

1 month

1 year

a nerve

all of the above

brains

spinal cord

nerve

the brain

muscle

wire

muscle cells

prison cells

glial cells

stem cells

stem cells

muscle cells

liver cells

skin cells

they regenerate very quickly

they are very long compared to other cells in the body

they do not have a nucleus

they help carry oxygen to different parts of your body

Purkinje neurons

bipolar neurons

multipolar neurons

pyramidal neurons