10 years

100 years

1 year

1 month

hormonal

telegraph

electrical impulses

proteins

they regenerate very quickly

they do not have a nucleus

they are very long compared to other cells in the body

they help carry oxygen to different parts of your body

stem cells

muscle cells

skin cells

liver cells

100 miles per hour

150 meters per second

1 meter per second

1 foot per second

all of the above

brains

a nerve

spinal cord

muscle cells

glial cells

prison cells

stem cells

Purkinje neurons

bipolar neurons

pyramidal neurons

multipolar neurons

the brain

muscle

nerve

wire