proteins

hormonal

electrical impulses

telegraph

the brain

wire

nerve

muscle

spinal cord

all of the above

a nerve

brains

1 foot per second

100 miles per hour

150 meters per second

1 meter per second

glial cells

prison cells

stem cells

muscle cells

pyramidal neurons

bipolar neurons

Purkinje neurons

multipolar neurons

muscle cells

stem cells

liver cells

skin cells

10 years

1 month

100 years

1 year

they help carry oxygen to different parts of your body

they regenerate very quickly

they do not have a nucleus

they are very long compared to other cells in the body