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

skin cells

liver cells

stem cells

100 years

1 year

1 month

10 years

wire

muscle

nerve

the brain

1 meter per second

1 foot per second

100 miles per hour

150 meters per second

bipolar neurons

multipolar neurons

pyramidal neurons

Purkinje neurons

spinal cord

a nerve

all of the above

brains

glial cells

stem cells

muscle cells

prison cells

hormonal

telegraph

proteins

electrical impulses