2.1-2.6 Flashcards
an extensive network of specializd cells that carry information to and from all parts of the body.
Nervous System
deals with the structure and function of neurons, nerves, and nervous tissue.
Neuroscience
the basic cell that makes up the nervous system and which received and sends messages within that system.
Neurons
branch-like structures that receive messages from other neurons.
Dendrites
the cell body of the neuron, responsible for maintaining the life of the cell.
Soma
long tube-like structure that carries the neural message to other cells.
Axon
grey fatty cells that provide support for the neurons to grow and around, deliver nutrients to neurons, produce myelin to coat axons.
Glial cells
fatty substances produced by certain glial cells that coat the axons of neurons to insulate, protect, and speed up the neural impulse.
Myelin
bundles of axons in the body that travel together through the body. Tunnel through which damaged nerve fibers can repair themselves.
Nerves
Schwann’s membrane
Neurilemma
charged particles
ions
Inside neuron -
negatively charged.
Outside neuron
- positively charged.
The state of the neuron when not firing a neural impulse.
Resting potential
the release of the neural impulse consisting of a reversal of the electrical charge within the axon.
Action potential
referring to the fact that a neuron either fires completely or does nnot dire at all.
All-or-none-
Sending the message to other cells
Neuron Communication
branches at the end of the axon.
Axon terminals
rounnded areas on the end of axon terminals.
Synaptic knob
sack-like structures found inside the synaptic knob containing chemicals.
Synaptic vesicles
chemical found in the synaptic vesicles which, when released , has an effect on the next cell.
Neurotransmitters
microscopic fluid-filled space between the rounded areas on the end of the axon terminals of one cell and the dendrites or surface of the next cell.
Synapse/Synaptic Gap
Holes in the surface of the dendrutes or certain cells of the muscles and glads, which are shaped to fit only certain neurotransmitters.
Receptor Sites -
neurotransmitter that causes the receiving cell to fire.
Excitatory neurotransmitter
neurotransmitter that causes the receiving cell to stop firing.
Inhibitory neurotransmitter
mimic or enhance the effects of a neurotransmitter on the receptor sites of the next cell, increasing or decreasing the activity of that cell.
Agonists
block or reduce a cell’s response to the action of other chemicals or neurotransmitters.
Antagonists
Involved in arousal, attention, memory, and controls muscle contractions (EI)
Acetylcholine