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________ channels open or close in response to binding of neurotransmitter.         

Making rapid adjustments to maintain balance and equilibrium are functions of the  

The axon hillock is a region between what two general regions of a neuron?    

The following events of a reflex arc are NOT in the correct order. Place them in the correct order.               (1) Motor neuron carries signal to muscle             (2) Sensory neuron carries signal to spinal cord             (3) Stimulus activates sensory receptor             (4) Processing in the CNS             (5) Contraction or relaxation of the muscle

The external acoustic meatus ends at the          

Each of the following nerves originates in the lumbar plexus except the ________ nerve.  

The minimum stimulus required to trigger an action potential is known as the    

Clusters of ganglionic sympathetic neurons lying along either side of the spinal cord are called sympathetic ________ ganglia.  

The period during which an excitable membrane cannot respond to further stimulation is the ________    

The parasympathetic nervous system is especially active during which physiological state?