NERVOUS SYSTEM - STRUCTURES OF N.S Flashcards Preview

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Flashcards in NERVOUS SYSTEM - STRUCTURES OF N.S Deck (37):
1

What is the function of Neuroglia Cells?

Provide support and protection to neurons

2

A dendrites function is known as?

Input portion

3

What is Dopamine?

The brain's 'reward and pleasure' centre. Responsible for emotional responses/addictive behaviours

4

Which neuron contain a peripheral process and a central process?

Unipolar

5

Which neuron structure contain one main dendrite and one axon?

Bipolar

6

If neurotransmitter is inhibitory, AP is ______ likely

Less

7

Describe function of Sensory/Afferent Neurons.

Located at the dendrite ends. Once activated by a stimulus, AP forms and travels along the axon and into the CNS

8

An axons function is known as?

Output portion

9

Acetylcholine (ACh)

x

10

What is Myelin and its function?

Layers of lipid and protein covering to speed up AP

11

Define the Blood-Brain Barrier (BBB).

A barrier that prevents the passage of materials from the blood and the brain. Protects brains from harmful substances.

12

Astrocytes

Assists Blood-Brain Barrier and provide nutrients to neurons

13

What is PRE-Synaptic Neuron?

The neuron SENDING signals

14

What do Oligodendrocytes form and maintain?

Forms myelin sheath of CNS neurons

15

Which neuron structure contains several dendrites and one axon?

Multipolar

16

What is an Action Potential?

An electrical signal travelling along the cell membrane

17

The peripheral axon of a unipolar neuron contain?

Sensory Receptors

18

What is POST-Synaptic Neuron?

The neuron RECEIVING singals

19

What is Serotonin?

A chemical controlling mood/sleep/appetite/temperature regulation/sensory perception

20

The central axon of a unipolar neuron contain?

Axon Terminals

21

What is the function of the 'Microglia'?

It is a phagocytotic cell, that removes debris

22

What is Cerebrospinal Fluid (CSF)?

A colourless fluid that circulates the brain and spinal cord.

23

Describe Schwann Cells.

Found and functions in the PNS. They encircle the axon, form myelin sheath, and involved in regeneration

24

Describe the function of Motor/Efferent Neurons.

The AP travels away from CNS, to the effectors

25

Describe the function of Interneurons/Asscoiation Neurons.

The communication between sensory and motor neurons. Processes information (sensory.n) and activates response (motor.n) if needed.

26

If neurotransmitter is excitatory, AP is ______ likely

More

27

Define Synaptic Cleft.

Space between communicating neurons

28

A cell body/soma function is?

Processes protein to parts of the neurons

29

Gamma-Aminobutyric Acid (GABA)

x

30

What is Synapses?

Site of communication between two neurons or with another cell

31

Where are the Synaptic End Bulbs located?

The ends of Axon Terminals

32

Explain a Electrical Synapses.

APs conduct directly between the plasma membranes through gap junctions

33

What is a Stimulus?

A major change in environment (internal/external) that activates an AP

34

Where are Axon Terminals located?

The ends of an axon

35

Explain Chemical Synapses.

AP reaches the end of the pre-synaptic neuron, the release of a neurotransmitter diffuses across the synaptic cleft, binds to the post-synaptic neuron

36

Neurotransmitter (NT)

A chemical released by the pre-synaptic neuron to affect the post-synaptic neurons or effector

37

What is the function of Ependymal cells?

Produce and circulate cerebrospinal fluid in brain and spinal cord