they help carry oxygen to different parts of your body

they regenerate very quickly

they do not have a nucleus

they are very long compared to other cells in the body

muscle

wire

the brain

nerve

all of the above

spinal cord

brains

a nerve

1 month

10 years

1 year

100 years

100 miles per hour

1 foot per second

150 meters per second

1 meter per second

bipolar neurons

pyramidal neurons

Purkinje neurons

multipolar neurons

electrical impulses

telegraph

hormonal

proteins

stem cells

prison cells

glial cells

muscle cells

muscle cells

stem cells

liver cells

skin cells