Nervous Tissue And Central Nervous System an der Our Lady Of Fatima University | Karteikarten & Zusammenfassungen

Lernmaterialien für nervous tissue and central nervous system an der Our Lady of Fatima University

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What type of action potential propagation is Continuous conduction?

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type of action potential propagation which involves step-by-step depolarization and repolarization of each adjacent segment of the plasma membrane - occurs in unmyelinated axons and in muscle fibers.

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In Brain and Spinal cord, What is Gray Matter?

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-called as such because of its darker appearance and preponderance of nerve cell bodies.


-In a surface layer (cortex) of the cerebrum and cerebellum. 


Nucleus: designates a mass of gray matter in any part of the brain or spinal cord 


Ganglion: means cluster of nerve cell bodies and dendrites, but usually refers to those cells located outside the brain and spinal cord.

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In Neuroglia of PNS, What is Schwann cell?

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form the myelin sheaths around nerve fibers that are found in the PNS.

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What is Resting Membrane Potential?

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A resting (non-signaling) neuron that has a voltage across its membrane.


-• In a resting neuron, there are concentration gradients across the membrane for Sodium + Potassium. Ions move down their gradients via channels, leading to a separation of charge that creates the resting potential.

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What is Propagation of action potential?

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Depolarization of the first membrane patch causes permeability changes in the adjacent membrane and are repeated.

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What is Repolarization?

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Potassium diffuses out of the cell as the membrane permeability changes again, restoring the negative charge on the inside of the membrane and the positive charge on the outside surface

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What is Reflexes?

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-It is rapid, predictable and involuntary responses to stimuli


-Occurs over neural pathways called reflex arcs and involve both CNS and PNS structures

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What is Initial ionic conditions restored?


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Ionic conditions of the resting state are restored later by the activity of sodium potassium pump.

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In Reflexes, What is the difference between Somatic and Autonomic?

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Somatic: reflexes that stimulate skeletal muscles


Autonomic: regulate the activity of smooth muscles, heart and glands

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In Neuroglia of CNS, What is Microglia?

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spider like phagocytes that dispose of debris , include deed brain cells and bacteria

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In Neuroglia of CNS, What is Oligodendrocytes?

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glia that wrap their flat extensions tightly around the nerve fibers , producing fatty insulating coverings called myelin sheaths

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In Neuroglia of PNS, What is Satellite cells ?

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act as protective , cushioning cells.

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Q:

What type of action potential propagation is Continuous conduction?

A:

type of action potential propagation which involves step-by-step depolarization and repolarization of each adjacent segment of the plasma membrane - occurs in unmyelinated axons and in muscle fibers.

Q:

In Brain and Spinal cord, What is Gray Matter?

A:

-called as such because of its darker appearance and preponderance of nerve cell bodies.


-In a surface layer (cortex) of the cerebrum and cerebellum. 


Nucleus: designates a mass of gray matter in any part of the brain or spinal cord 


Ganglion: means cluster of nerve cell bodies and dendrites, but usually refers to those cells located outside the brain and spinal cord.

Q:

In Neuroglia of PNS, What is Schwann cell?

A:

form the myelin sheaths around nerve fibers that are found in the PNS.

Q:

What is Resting Membrane Potential?

A:

A resting (non-signaling) neuron that has a voltage across its membrane.


-• In a resting neuron, there are concentration gradients across the membrane for Sodium + Potassium. Ions move down their gradients via channels, leading to a separation of charge that creates the resting potential.

Q:

What is Propagation of action potential?

A:

Depolarization of the first membrane patch causes permeability changes in the adjacent membrane and are repeated.

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Q:

What is Repolarization?

A:

Potassium diffuses out of the cell as the membrane permeability changes again, restoring the negative charge on the inside of the membrane and the positive charge on the outside surface

Q:

What is Reflexes?

A:

-It is rapid, predictable and involuntary responses to stimuli


-Occurs over neural pathways called reflex arcs and involve both CNS and PNS structures

Q:

What is Initial ionic conditions restored?


A:

Ionic conditions of the resting state are restored later by the activity of sodium potassium pump.

Q:

In Reflexes, What is the difference between Somatic and Autonomic?

A:

Somatic: reflexes that stimulate skeletal muscles


Autonomic: regulate the activity of smooth muscles, heart and glands

Q:

In Neuroglia of CNS, What is Microglia?

A:

spider like phagocytes that dispose of debris , include deed brain cells and bacteria

Q:

In Neuroglia of CNS, What is Oligodendrocytes?

A:

glia that wrap their flat extensions tightly around the nerve fibers , producing fatty insulating coverings called myelin sheaths

Q:

In Neuroglia of PNS, What is Satellite cells ?

A:

act as protective , cushioning cells.

nervous tissue and central nervous system

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