1 year

100 years

1 month

10 years

liver cells

muscle cells

stem cells

skin cells

they regenerate very quickly

they help carry oxygen to different parts of your body

they do not have a nucleus

they are very long compared to other cells in the body

the brain

wire

nerve

muscle

glial cells

stem cells

muscle cells

prison cells

telegraph

electrical impulses

hormonal

proteins

Purkinje neurons

pyramidal neurons

multipolar neurons

bipolar neurons

a nerve

brains

all of the above

spinal cord

150 meters per second

1 meter per second

100 miles per hour

1 foot per second