electrical impulses

telegraph

hormonal

proteins

liver cells

muscle cells

skin cells

stem cells

1 month

10 years

1 year

100 years

brains

a nerve

spinal cord

all of the above

100 miles per hour

1 meter per second

1 foot per second

150 meters per second

prison cells

muscle cells

stem cells

glial cells

bipolar neurons

Purkinje neurons

multipolar neurons

pyramidal neurons

they are very long compared to other cells in the body

they regenerate very quickly

they do not have a nucleus

they help carry oxygen to different parts of your body

the brain

wire

nerve

muscle