proteins

electrical impulses

hormonal

telegraph

1 month

100 years

10 years

1 year

glial cells

stem cells

prison cells

muscle cells

brains

spinal cord

all of the above

a nerve

100 miles per hour

1 foot per second

150 meters per second

1 meter per second

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

they regenerate very quickly

wire

muscle

nerve

the brain

liver cells

skin cells

muscle cells

stem cells

multipolar neurons

bipolar neurons

pyramidal neurons

Purkinje neurons