1. A neuron fiber that sends a signal from your hand to your brain is called a _______.

a. axon
b. cell body
c. mitochondriond
d. dendrite

2. at approximately what age does nerve conduction achieve maximum capacity?

a. 5
b. 10
c. 20
d. 30

3.insulin is to glucagon as ______.

a. wet is to dry
b. walking is to running
c. morning is to afternoon
d. a key is to lock