1 month

100 years

1 year

10 years

stem cells

muscle cells

skin cells

liver cells

they do not have a nucleus

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

they regenerate very quickly

150 meters per second

1 meter per second

100 miles per hour

1 foot per second

electrical impulses

hormonal

telegraph

proteins

multipolar neurons

bipolar neurons

Purkinje neurons

pyramidal neurons

prison cells

glial cells

stem cells

muscle cells

nerve

muscle

wire

the brain

a nerve

brains

all of the above

spinal cord