they regenerate very quickly

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

muscle cells

stem cells

glial cells

prison cells

proteins

hormonal

telegraph

electrical impulses

100 miles per hour

1 foot per second

1 meter per second

150 meters per second

liver cells

muscle cells

skin cells

stem cells

nerve

wire

the brain

muscle

1 month

1 year

10 years

100 years

brains

all of the above

a nerve

spinal cord

pyramidal neurons

multipolar neurons

bipolar neurons

Purkinje neurons