1 month

10 years

100 years

1 year

electrical impulses

hormonal

telegraph

proteins

brains

a nerve

all of the above

spinal cord

they help carry oxygen to different parts of your body

they regenerate very quickly

they do not have a nucleus

they are very long compared to other cells in the body

the brain

muscle

wire

nerve

Purkinje neurons

bipolar neurons

multipolar neurons

pyramidal neurons

1 foot per second

150 meters per second

100 miles per hour

1 meter per second

skin cells

liver cells

stem cells

muscle cells

prison cells

glial cells

muscle cells

stem cells