Ch 9 Nervous tissue

Question 1

3** responsible for communication and coordination of all the body

Answer 1

Sensory
Interpretation
Motor

Question 2

2 parts of Central Nervous System

Answer 2

Brain
spinal cord

Question 3

Peripheral Nervous system

Answer 3

Any nerves outside CNS
Connects the rest of the body with the CNS
Has a subdivision (autonomic nervous system)

Question 4

Cells of nervous system

Answer 4

Neurons
Neuroglia (glia) “glue like”

Question 5

Neurons do what

Answer 5

conduct a nerve impulse

Question 6

3 parts (body) of Neurons

Answer 6

Cell body
Dendrites (receiving/input fibers)
Axon (sends signal out)

Question 7

3 types of Neuron

Answer 7

Sensory (afferent)
Interneurons (connection)
Motor (efferent)

Question 8

Axon detailed 3*

Answer 8

Axon terminals
Myelin Sheath
Nodes of Ranvier

Question 9

Axon terminals

Answer 9

storage spot for neurotransmitter (arch)

Question 10

Myelin sheath

Answer 10

Covering or layer of white fatty material , protects and insulated the nerve fibers

increases speed of transmission

Question 11

Nodes of Ranvier

Answer 11

Gaps in the myelin sheath

allows for electrical impulse to travel more quickly

Question 12

Nueroglia of CNS

Answer 12

astrocytes
oligodendrytes
microglia
ependymal cells

Question 13

Neuroglia of the PNS

Answer 13

Schwann cells

Satellite cells

Question 14

Astrocytes “star cells”

Answer 14

Prevents blood toxins from entering the nervous system

Question 15

Microglia

Answer 15

Smaller Astrcytes

Question 16

Obligodendrytes

Answer 16

help hold fibers together
produce myelin sheath

Question 17

Ependymal Cells

Answer 17

Line the inside of the ventricles of the brain and spinal cord

Produce CSF

Question 18

Satellite cells

Answer 18

Flat cells around the cell body

provide structural support

Question 19

Schwann cells

Answer 19

Form the myelin sheath that is wrapped around an axon= nurolemma

allow nerves to somewhat regenerate (not in cns, damage is harder to fix)

Question 20

White matter

Answer 20

appears white from the myelinated fibers

found in both cns and pns

Question 21

Gray matter

Answer 21

consists of cell bodies, interneurons and unmyelinated fiber
Dispersed throughout the white matter
in PNS-gangalia
CNS- nuclei

Question 22

Neurons transmit information

Answer 22

Contact or sensory input

Electrical signal called ACTION POTENTIAL or “nerve impulse”

Question 23

Saltatory Conduction

Answer 23

movement along myelinated axons

leaps or jumps from Node of ranvier to next

allows nerve impulses to travel long distances faster

Question 24

Plasticity

Answer 24

capability to change based on experiences

Question 25

Nuerogenesis

Answer 25

creation of new nerve fibers

Question 26

nervous tissue regeneration and repair CNS

Answer 26

mis h slower if it happens at all due to lack of nuerolemma on nerve fibers

Question 27

regeneration and repair of nervous tissue PNS

Answer 27

made possible by schwann cells and nuerolemma that are producing

Question 28

Epilepsy

Answer 28

short recurrent attacks of motor and sensory or psychological malfunction

Question 29

Epileptic Seizures

Answer 29

abnormal reverberating circuits could be the cause