100 years

1 month

10 years

1 year

electrical impulses

hormonal

telegraph

proteins

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

they do not have a nucleus

bipolar neurons

multipolar neurons

Purkinje neurons

pyramidal neurons

glial cells

stem cells

prison cells

muscle cells

150 meters per second

1 meter per second

1 foot per second

100 miles per hour

spinal cord

a nerve

brains

all of the above

muscle cells

liver cells

stem cells

skin cells

nerve

wire

muscle

the brain