hormonal

telegraph

electrical impulses

proteins

bipolar neurons

Purkinje neurons

multipolar neurons

pyramidal neurons

muscle cells

stem cells

skin cells

liver cells

1 year

10 years

100 years

1 month

glial cells

muscle cells

prison cells

stem cells

spinal cord

all of the above

a nerve

brains

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

they regenerate very quickly

they do not have a nucleus

muscle

nerve

the brain

wire

100 miles per hour

1 foot per second

150 meters per second

1 meter per second