Once a neuron reaches threshold membrane potential, the action potential can only travel in one direction, towards the axon terminals. (2 points)

When considering the electrochemical gradient of potassium ions, the electric gradient counteracts (is opposite) the chemical gradient of the ion. (2 points)

Efferent neurons carry electrical signals toward the central nervous system. (2 points)

When considering the electrochemical gradient of sodium ions, the electric gradient counteracts (is opposite) the chemical gradient of the ion. (2 points)  

Which of the following functional classes of neurons is found entirely within the CNS (does not enter / exit periphery)?

A neurotransmitter binds to and opens chemical-gated Cl- channels on the dendrites of an interneuron. There is a greater concentration of Cl- outside of the cell than inside of the cell. What will happen next?

Using the image above, if the axon on neuron 3 was damaged, what is one potential result? (3 points)

Using the specific circuit shown above, which neuron is associated with the ventral root?

Which of the following cell types make up the majority of the epidermis? (2 points)

Which of the following is the type of connective tissue that surrounds an entire nerve. (2 points)