Question 1
The basic unit of the nervous system is
◦ the neuron.
◦ neuroglia.
◦ the brain.
◦ a nerve.
◦ a nerve impulse.
Question 2
The blood-brain barrier consists of
◦ membranes surrounding the neurons of the brain.
◦ cells lining the wall of the brain capillaries.
◦ vesicles of cerebrospinal fluid.
◦ the cerebral cortex.
◦ the meninges.