Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Histology > Nervous Tissues > Flashcards

Nervous Tissues Flashcards

1
Q

What are the 3 parts of neurons

A

Dendrites, cell body, and axons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

It receives messages from other neurons

A

Dendrites

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Contains the genetic information determining cell function

A

Cell body

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Conducts electrical impulses

A

Axons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Brain and spinal cord

A

CNS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Nerves or nerve fiber

A

PNS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

It is a bundle of central axons

A

Nerve tract

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Bundle of peripheral axons

A

Nerve fiber

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

It has myelinated axons

A

White matter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

It has cell bodies and unmyelinated

A

Gray matter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Excitable cells that transmit electrixal signals

A

Neurons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Cells that surround and wrap neurons
-maintain homeostasis, form myelin and provide support for neurons
-non neuronal in CNS
- do not produce electrical impulse PNS

A

Neuroglia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

It is around invidividual axon

A

Endoneurium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

It is around individual fascicle

A

Perineurium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

It is around entire nerve

A

Epineurium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

It is afferent, arrives or bring stimuli
- info is transmitted from sensory receptor to CNS

A

Sensory neuron

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

It is efferent, exits or carry response
-info is from CNS to the effector cell

A

Motor neuron

18
Q

It is found between sensory and motor which acts as mediator (bridge of communication)

A

Interneuron

19
Q

It only has one axon

A

Unipolar

20
Q

It has one axon and one dendrite

A

Bipolar

21
Q

One axon but dendrites not coming from soma (cell body)

A

Pseudounipolar

22
Q

Has many dendrites and one axon

A

Multipolar

23
Q

What are the characteristics of ependymal cells

A

-Forms epithelial lining of ventricles (cavities) in the brain and central canal of spinal cord
- production and regulation of CSF
- apical surface covered of cilia that circulates CSF around CNS and has microvilli to absorb CSF

24
Q

Produces myelin sheath

A

Oligodendrocyte

25
Q

What is astrocytes

A

Specialized glial cells that outnumber neurons
-structural support insulating receptive surfaces, and buffer extracellular compartment
-during inflammation and injury they wall off damaged areas

26
Q

Specialized macrophages that remove damaged neurons and infections
-maintain health of CNS
-professional innate phagocytes

A

Microglial cells

27
Q

Surrounds neurons in PNS, support and protect

A

Satellite cells

28
Q

Covers the neuron in myelin and alsi maintain nerve fibers PNS

A

Schwann cells

29
Q

Why RMP is negative?

A

K+ positive leaks from inside that geneeate negative charge inside, so Na+ and K+ do not attain equilibrium

30
Q

Steps of nerve conduction

A
  1. Neurons have resting membrane potential (-70 mV) > polarization
  2. Neurons are surrounded by high concentration of Na+
  3. The inside of neuron has some positively K+ ions and many charged ions (proteins and sulfates)
  4. Combination of Na+ environment outside and K+ positive inside = resting membrane potential
31
Q

Also called as action potentials
- a self propagating wave of electrical disturbance
-electrochemical signal

A

Nerve impulses

32
Q

Steps of nerve conduction: the action potential

A
  1. Dendrites are stimulated by axons of other neurons
  2. Na+ ions flow into the neuron by action of ion channels - membrane voltage positive = depolarization
  3. If the partial depolarization reaches -.65 mV (Ap threshold) the neurons fire
33
Q

Na influx

A

Depolarization

34
Q

K efflux

A

Repolarization

35
Q

Na+ and K+ pump

A

Recharging

36
Q

What are the effects of neurotransmitters?

A
  1. Excitatory neurotransmitters depolarize the postsynaptic cell membrane by stimulating the inflow of sodium ions
  2. Hyperpolarize the membraine by stimulating ion channels to allow K+ ions flow out, inhiniting neuron firing
37
Q

Involved in memory and muscle activity

A

Acetylcholine (ACh)

38
Q

Enhances mood, eating, sleep, and sexual behavior

A

Serotonin

39
Q

An excitatory transmitter

A

Dopamine

40
Q

Reduce pain and increase feeling of well being

A

Endorphins

Histology (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions