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Section 2: Sample Questions
Terms in this set (16)
Electrical and chemical communication within the nervous system is mediated primarily by ___
What are astrocytes?
Star shaped glial cells that provide structural and metabolic support for neurons. They also interact with blood vessels to form the blood-brain barrier
What are oligodendrocytes?
Glial cells that produce the myelin sheath in the CNS
What are Schwann cells?
Glial cells that produce the myelin sheath in the PNS
What are meninges?
Membranous coverings between neural tissue and bone
Neurotransmitters are released from ___
What is a cell body?
The portion of the neuron that contains the nucleus and protein synthesis mechinery
What is a dendrite?
The branching structures of a neuron that receives messages
What is the myelin sheath?
Insulation for axons that speed up signals
The junction between the cell body and the axon is referred to as the ___. Where electrical signals are initiated.
What is the junction between an axon terminal and a dendrite called?
The depolarizing phase of a nerve action potential is due to the ___
Opening of sodium ion channels
The repolarization/hyperpolarization phase of a nerve action potential is due to the ___
Opening of potassium ion channels
A graded membrane potential ___
Exhibits a magnitude dependent on the strength of the stimulus
Graded potentials only lead to an action potential if ___
Depolarization beyond the threshold potential occurs
Grade potentials ___ in amplitude with an increasing distance from the point of stimulus
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