they do not have a nucleus

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

they regenerate very quickly

stem cells

skin cells

liver cells

muscle cells

1 month

100 years

10 years

1 year

all of the above

brains

a nerve

spinal cord

stem cells

muscle cells

prison cells

glial cells

1 meter per second

1 foot per second

100 miles per hour

150 meters per second

muscle

wire

the brain

nerve

bipolar neurons

pyramidal neurons

Purkinje neurons

multipolar neurons

electrical impulses

hormonal

telegraph

proteins