hormonal

telegraph

electrical impulses

proteins

muscle cells

prison cells

glial cells

stem cells

multipolar neurons

pyramidal neurons

bipolar neurons

Purkinje neurons

1 foot per second

150 meters per second

100 miles per hour

1 meter per second

1 year

100 years

1 month

10 years

skin cells

liver cells

muscle cells

stem cells

they are very long compared to other cells in the body

they do not have a nucleus

they regenerate very quickly

they help carry oxygen to different parts of your body

a nerve

spinal cord

all of the above

brains

muscle

wire

nerve

the brain