telegraph

hormonal

proteins

electrical impulses

skin cells

muscle cells

stem cells

liver cells

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

bipolar neurons

pyramidal neurons

multipolar neurons

Purkinje neurons

muscle cells

glial cells

prison cells

stem cells

10 years

1 year

1 month

100 years

1 foot per second

1 meter per second

100 miles per hour

150 meters per second

the brain

wire

nerve

muscle

spinal cord

brains

a nerve

all of the above