100 years

10 years

1 year

1 month

proteins

telegraph

electrical impulses

hormonal

spinal cord

brains

all of the above

a nerve

Purkinje neurons

bipolar neurons

pyramidal neurons

multipolar neurons

stem cells

muscle cells

prison cells

glial cells

muscle cells

liver cells

skin cells

stem cells

the brain

nerve

muscle

wire

they help carry oxygen to different parts of your body

they regenerate very quickly

they do not have a nucleus

they are very long compared to other cells in the body

1 foot per second

150 meters per second

100 miles per hour

1 meter per second