Neurophysiology 1
Studied by 0 people
Call with Kai
Learn
Practice Test
Spaced Repetition
Match
Flashcards
Knowt Play1/40
There's no tags or description
Looks like no tags are added yet.
Name | Mastery | Learn | Test | Matching | Spaced | Call with Kai |
|---|
No study sessions yet.
41 Terms
What is the Primary function of nervous system?
To collect sensory information, integrate/organize it, and produce a motor output.
What is the Functional unit of nervous system
a Neuron.
What are the Main parts of a neuron?
the Dendrites, soma, axon, presynaptic terminal.
What is the Dendrite function
it Receives incoming signals.
What is the Soma function
the Metabolic center containing nucleus and organelles.
What is the axon function
It Conducts action potentials away from soma.
What does the Presynaptic terminal do?
it Releases neurotransmitters to target cells.
What is the role of glial cells
To support, protect, and modulate neuronal function.
What is the Astrocyte function
To buffer ions, regulate neurotransmitters, support synapses.
What is the Oligodendrocyte function
To Produce myelin in the CNS.
What is theSchwann cell function
To Produce myelin in the PNS.
What is the Purpose of myelin
To Increases speed of action potential conduction, through protection & isolation of the axon
Define “Centralization of nervous system”
The Concentration of integrating neurons into central regions.
What is Cephalization
The Concentration of nervous tissue in the head (forming the brain)
What are the Major divisions of the nervous system?
Central Nervous System (CNS) and the Pereferal Nervous System (PNS)
What are the components of the CNS?
The Brain and spinal cord.
What are the components of the PNS?
The Cranial and spinal nerves.
What are Afferent neurons?
The Sensory neurons carrying signals toward CNS.
What are Efferent neurons?
The Motor neurons carrying signals away from CNS.
What does the Somatic motor system do?
It Controls skeletal muscles.
What does the Autonomic nervous system do?
It Controls involuntary targets.
What is the Sympathetic division?
The Fight-or-flight responses.
What is the Parasympathetic division
The Rest-and-digest functions.
What is the Resting membrane potential
Approximately −70 mV.
Whe is the Cause of resting potential
The Unequal ion distribution and membrane permeability.
What are the Primary ions involved in the firing of neurons?
Na⁺ and K⁺ ions
What is the Na⁺/K⁺ pump function
They push ions against the concetration gradient to maintain proper ion ratios in and out of the cell.
What is the definition of an Action potential
A Rapid, regenerative change in membrane potential.
What is the Threshold potential?
The membrane potential required to excite the neuron, About −55 mV.
What is the All-or-none principle?
The Action potential size is constant once threshold is reached. If threshhold isnt reeached, neuron doesn’t fire.
What is Conduction velocity dependence?
The Axon diameter and myelination determin the velocity of the singal sent.
What is altatory conduction?
When Action potentials jump between nodes of Ranvier.
What is an Electrical synapse
A Direct ion flow via gap junctions in the mylelin sheath
What is a Chemical synapse?
The Signal transmitted between neurons via chemical neurotransmitters.
What is the Direction of a chemical synapse
It is unidirectional.
What do Synaptic vesicles do?
They Store neurotransmitters.
What is the Active zone?
Thje site of neurotransmitter release.
What are the Major neurotransmitter classes?
The Amino acids, amines, peptides, gases, endocannabinoids.
What is the EPSP definition?
The Excitatory postsynaptic potential.
What is the IPSP definition?
The Inhibitory postsynaptic potential.
What is the Integration of synaptic input
When a neuron combines thousands of EPSPs and IPSPs, it sums them up to determine whether the total input reaches the threshold.
Note 
Flashcards (68)