100 years

10 years

1 year

1 month

brains

all of the above

a nerve

spinal cord

they do not have a nucleus

they regenerate very quickly

they are very long compared to other cells in the body

they help carry oxygen to different parts of your body

pyramidal neurons

bipolar neurons

Purkinje neurons

multipolar neurons

the brain

wire

nerve

muscle

hormonal

proteins

electrical impulses

telegraph

liver cells

skin cells

stem cells

muscle cells

stem cells

muscle cells

prison cells

glial cells

150 meters per second

1 meter per second

1 foot per second

100 miles per hour