liver cells

skin cells

muscle cells

stem cells

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

they regenerate very quickly

brains

a nerve

all of the above

spinal cord

muscle

the brain

nerve

wire

1 year

10 years

1 month

100 years

stem cells

prison cells

muscle cells

glial cells

multipolar neurons

pyramidal neurons

Purkinje neurons

bipolar neurons

1 foot per second

150 meters per second

1 meter per second

100 miles per hour

hormonal

proteins

electrical impulses

telegraph