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Nervous System Practice

Teacher: Deb Kelly
Across
When the membrane is in the _____ refractory period, even though repolarization is incomplete, a threshold stimulus of high enough intensity may trigger an impulse.
A _____ nerve cell is not being stimulated to send a nerve impulse.
Regarding a regenerating axon, nerve growth factors secreted by neuroglial cells may help direct the growing axon. However, the regenerating axon may still end up int he wrong place so full _____ often does not return.
A _____ neuron has only two processes, one arising from each end.
Cranial and spinal nerves that connect the ENS to other body parts is called the ________ nervous system.
A Unipolar neuron as a _____ process extending from it's cell body.
These are small cellular processes that receive input on a neuron.
______ are specialized to react to physical and chemical changes in their surroundings.
During the _____ refractory period, the axon's membrane is change in sodium permeability and cannot be stimulated.
Injury to the cell body of a neuron usually _____ the neuron.
Bundles of axons
An axon ends in a synaptic knob, very close to the receptive surface of another cell separated only by a space called the synaptic _____.
In the ____, regeneration of neurons is unlikely.
The autonomic nervous system controls viscera, such as the ______.
Every neuron has a ____ body, dendrites and an axon.
The potential difference across the cell membrane is called the transmembrane potential and is measured in _____.
Narrow gaps in the myelin sheath
The _____ of a neurotransmitter on a postsynaptic cell is either excitatory or inhibitory.
Down
In a multipolar neuron, the first part of the axon, the initial segment is often referred to as the ____ zone.
Brain and spinal cord
If neurons are depolarized sufficiently, the membrane potential reaches a level called the _____ potential.
Dendrites are usually highly ________.
The neurons lie within the brain and spinal cord and transmit impulses from one part of the brain or spinal cord to another.
A type of CNS neuroglia that commonly occur in rows along myelinated axons and the form myelin in the brain and spinal cord.
Nerve impulse conduction is an __ __ __ response.
Biological messenger molecules
A damaged peripheral axon may _____.
The motor functions of the nervous system employ neurons that carry impulses from the CNS to responsive structures called _____.
Generally, the somatic nervous system oversees ______ activities, such as skeletal muscle contraction.
An axon or nerve fiber, carries information away from the cell in the form of ______ signals called nerve impulses.
______ receptors convert their information in to nerve impulses which are then sent over the peripheral nerves to the CNS.
Axons that have myelin sheaths are called _____ axons.
If threshold is reach in a neuron, an action potential results which is the basis for a nerve _____.
Schwann cells and _____ cells are the two types of neuroglia in the PNS.
Another name for a motor neuron.
Neuroglial cells called ______ cells, found only in the PNS, encase the larger axons of peripheral neurons in a lipid rich sheath.