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

they do not have a nucleus

liver cells

skin cells

stem cells

muscle cells

100 years

1 month

1 year

10 years

hormonal

proteins

telegraph

electrical impulses

glial cells

muscle cells

stem cells

prison cells

150 meters per second

1 meter per second

100 miles per hour

1 foot per second

all of the above

brains

a nerve

spinal cord

Purkinje neurons

bipolar neurons

pyramidal neurons

multipolar neurons

nerve

the brain

muscle

wire