hormonal

telegraph

proteins

electrical impulses

they do not have a nucleus

they help carry oxygen to different parts of your body

they regenerate very quickly

they are very long compared to other cells in the body

1 year

100 years

10 years

1 month

1 foot per second

1 meter per second

100 miles per hour

150 meters per second

skin cells

liver cells

stem cells

muscle cells

all of the above

a nerve

brains

spinal cord

pyramidal neurons

bipolar neurons

Purkinje neurons

multipolar neurons

nerve

the brain

wire

muscle

glial cells

muscle cells

stem cells

prison cells