Chapter 11 TRUE

Reflexes are rapid, automatic responses to stimuli that will produce the same effect every time.

Cell bodies of sensory neurons may be located in ganglia lying outside the central nervous system.

During depolarization, the inside of the neuron's membrane becomes less negative.

Neurons in the NS are organized into functional groups.

Enkephalins and endorphins are peptides that act like morphine.

In myelinated axons the voltage-regulated sodium channels are concentrated at the nodes of Ranvier.

A postsynaptic potential is a graded potential that is the result of a neurotransmitter released into the synapse between two neurons.

Unipolar neurons have axons structurally divided into peripheral and central processes.

A stimulus traveling toward a synapse appears to open calcium ion channels at the presynaptic end, which in turn promotes fusion of synaptic vesicles tot he axonal membrane.

Axon diameter and degree of myelination determine nerve impulse conduction velocity.

The action potential is caused by permeability changes in the plasma membrane.