proteins

electrical impulses

hormonal

telegraph

150 meters per second

1 meter per second

100 miles per hour

1 foot per second

brains

spinal cord

all of the above

a nerve

they regenerate very quickly

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

nerve

wire

muscle

the brain

pyramidal neurons

multipolar neurons

Purkinje neurons

bipolar neurons

stem cells

liver cells

skin cells

muscle cells

1 month

100 years

10 years

1 year

muscle cells

glial cells

prison cells

stem cells