Nervous System Flashcards
The nervous system and the ______ system share the greatest responsibility for maintaining homeostasis.
B. Endocrine
Neurons that conduct nerve impulses from the receptors to the central nervous system are
D. Sensory neurons
Processes that carry impulses to another neuron are
B. Axons
Which of the following is an example of an effector?
E. Glands
The neuroglia that produce myelin in the peripheral nervous system are
E. Schwann cells
Groups of neuron cell bodies in the peripheral nervous system are called
E. Ganglion
A disorder of the central nervous system would involve the
E. Brain and spinal cord
Compared to unmyelinated axons, myelinated axons
A. Conduct impulses faster
The ability of nerve cells to respond to stimuli and to convert them into nerve impulses is called
C. Excitability
Saltatory conduction refers to the conduction impulses in
D. Myelinated neurons
Depolarization of a membrane is due to the
B. Opening of sodium channels
The stage in an action potential that immediately follows depolarization is
C. Restoration
The period of time during which neuron cannot generate another action potential is called
D. Refractory period
A group of nerve fibers in the central nervous system is called a
C. Tract
A stimulus strong enough to generate a nerve impulse is called
A. Threshold stimulus
The speed of nerve impulse conduction is determined by all of the following except
E. Synaptic strength
The junction between two nerve cells is called
D. Synapse
Neurotransmitters are stored in
B. Synaptic vesicles
Neurotransmitters are released at the
Axons terminal
Which of the following provides myelin for axons in the central nervous system?
Oligodendrocytes
Processes that receive impulses and conduct them toward the cell body are
A. Dendrites
Which of the following is an inhibitory neurotransmitter?
E. Serotonin
The nervous system has two principal divisions, the _____ and the ________
Central nervous system and peripheral nervous system
Nerve cells that conduct impulses from the central nervous system to muscles and glands are ____ neurons
Efferent
Sacs that store chemicals in the axon terminals area ______
Synaptic vesicles
A covering around axons, which is produced by neuroglia, is called ____
Myelin
The gaps in the myelin sheath along axons are called ___
Nodes
The type of impulse conduction in myelinated fibers is called ____
Saltatory conduction
The neuron before a synapse is a _____ neuron, the neuron located after a synapse is a _______
Presynaptic, postsynaptic
Axons terminals end in bulb-like structures called ______
Synaptic knob
Large diameter fibers conduct impulses ____ than small diameter fibers
Stronger
The chemicals stored in synaptic vesicles are referred to as _____
Neurotransmitters
The space between the Presynaptic and postsynaptic neuron is called
Synaptic cleft
A progressive destruction of the myelin sheaths of neurons in the CNS is ______
X
