hormonal

proteins

electrical impulses

telegraph

stem cells

muscle cells

skin cells

liver cells

spinal cord

all of the above

a nerve

brains

1 foot per second

1 meter per second

150 meters per second

100 miles per hour

prison cells

stem cells

glial cells

muscle cells

10 years

1 year

1 month

100 years

they regenerate very quickly

they are very long compared to other cells in the body

they help carry oxygen to different parts of your body

they do not have a nucleus

pyramidal neurons

multipolar neurons

Purkinje neurons

bipolar neurons

wire

muscle

nerve

the brain