they do not have a nucleus

they help carry oxygen to different parts of your body

they regenerate very quickly

they are very long compared to other cells in the body

spinal cord

a nerve

brains

all of the above

100 miles per hour

150 meters per second

1 meter per second

1 foot per second

electrical impulses

hormonal

telegraph

proteins

muscle

the brain

wire

nerve

Purkinje neurons

pyramidal neurons

bipolar neurons

multipolar neurons

1 year

100 years

10 years

1 month

skin cells

liver cells

muscle cells

stem cells

glial cells

stem cells

muscle cells

prison cells