brains

spinal cord

all of the above

a nerve

1 meter per second

1 foot per second

100 miles per hour

150 meters per second

they do not have a nucleus

they help carry oxygen to different parts of your body

they regenerate very quickly

they are very long compared to other cells in the body

prison cells

glial cells

stem cells

muscle cells

pyramidal neurons

bipolar neurons

Purkinje neurons

multipolar neurons

10 years

1 month

100 years

1 year

skin cells

stem cells

muscle cells

liver cells

telegraph

proteins

hormonal

electrical impulses

nerve

muscle

wire

the brain