hormonal

electrical impulses

telegraph

proteins

1 year

10 years

1 month

100 years

stem cells

muscle cells

prison cells

glial cells

a nerve

brains

spinal cord

all of the above

Purkinje neurons

bipolar neurons

multipolar neurons

pyramidal neurons

muscle

wire

the brain

nerve

muscle cells

stem cells

liver cells

skin cells

they do not have a nucleus

they regenerate very quickly

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

1 foot per second

100 miles per hour

1 meter per second

150 meters per second