telegraph

hormonal

electrical impulses

proteins

stem cells

muscle cells

prison cells

glial 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

100 miles per hour

1 foot per second

150 meters per second

1 meter per second

1 month

100 years

1 year

10 years

nerve

the brain

wire

muscle

pyramidal neurons

bipolar neurons

multipolar neurons

Purkinje neurons

muscle cells

skin cells

stem cells

liver cells

brains

a nerve

all of the above

spinal cord