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10 Cards in this Set

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  • Back
What are the 3 types of neurons and what do each of them do?
*Sensory neurons which carry impulses to the central nervous system
*Interneurons which carry impulses within the central nervous system
*Motor neurons which carry impulses from the central nervous system to effectors
What is neurilemma?
It is the delicate membrane that surrounds the axon of nerve cells. It promotes the regeneration of damaged axons.
Describe the function of the myelin sheath?
The myelin sheath is a fatty covering over the axon of a nerve cell.
What two positively charged ions are constantly flowing into and out of the resting neuron?
Potassium(K+) and Sodium(Na+)
State the differences between polarized, depolarization, and repolarization?
*Polarized membranes are charged membranes. Polarization is caused by the unequal distribution of positively charged ions.
*Depolarization is caused by the diffusion of sodium ions into the nere cell. Excess positive ions are found inside the nerve cell.
*Repolarization is a process in which the original polarity of the nerve membrane is restored. Excess positive ions are found outside the nerve membrane.
_________ _______ is the recovery time required before a neuron can produce another action potential?
Refractory period
The nervous system can be divided down into two main divisions: the central nervous system(CNS) or the peripheral nervous system(PNS). Describe the difference between these two systems?
*The central nervous system contains the nerves of the brain and the spinal cord. The central nervous system acts as a coordinating center for incoming and outgoing information.
*The peripheral nervous system carries information between the organs of the body and the central nervous system.
The resting membrane(unstimulated neuron) normally has a charge near ___mV;however, when activated, the same membrane registered ___mV. The reversal of this charge is called an ____________ ________?
-70mV, +40mV, an action potential
What is a threshold level?
It is the minimum level of a stimulus required to produce a response.
Nerve cells respond to changes in what four things?
*specific chemicals
*or most commonly in laboratorysettings by electrical shock