they do not have a nucleus

they regenerate very quickly

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

spinal cord

a nerve

all of the above

brains

the brain

nerve

wire

muscle

glial cells

stem cells

prison cells

muscle cells

electrical impulses

proteins

hormonal

telegraph

100 miles per hour

1 foot per second

1 meter per second

150 meters per second

bipolar neurons

pyramidal neurons

multipolar neurons

Purkinje neurons

liver cells

muscle cells

skin cells

stem cells

100 years

10 years

1 month

1 year