1 month

1 year

10 years

100 years

hormonal

telegraph

electrical impulses

proteins

a nerve

spinal cord

all of the above

brains

they are very long compared to other cells in the body

they do not have a nucleus

they regenerate very quickly

they help carry oxygen to different parts of your body

muscle

nerve

the brain

wire

muscle cells

skin cells

stem cells

liver cells

150 meters per second

1 meter per second

1 foot per second

100 miles per hour

stem cells

glial cells

muscle cells

prison cells

pyramidal neurons

multipolar neurons

Purkinje neurons

bipolar neurons