spinal cord

a nerve

all of the above

brains

stem cells

muscle cells

skin cells

liver cells

100 years

10 years

1 year

1 month

proteins

electrical impulses

hormonal

telegraph

100 miles per hour

1 meter per second

1 foot per second

150 meters per second

muscle

wire

nerve

the brain

multipolar neurons

bipolar neurons

Purkinje neurons

pyramidal neurons

they help carry oxygen to different parts of your body

they do not have a nucleus

they regenerate very quickly

they are very long compared to other cells in the body

prison cells

glial cells

stem cells

muscle cells