Nervous System

Question 1

2 Major Regulatory Systems Of The Body

Answer 1

Nervous & Endocrine Systems

Both Specialized To Make The Proper Responses To Stimuli

Question 2

2 Important Properties Of Neurons

Answer 2

Excitability: Ability To Respond To A Stimulus
Conductivity: Ability To Transmit A Signal

Question 3

Neuroglia

Answer 3

Specialized Cells That Support Neurons

Ex. Phagocytize Foreign Substances, Produce Cerebrospinal Fluid, Form Myelin Sheaths Around Axons

Question 4

CNS

Answer 4

Brain & Spinal Cord

Question 5

PNS

Answer 5

All Nervous Tissue Outside CNS

Delivers Sensory Info To CNS & Carries Motor Commands To Peripheral Tissues & Systems

Question 6

Divisions Of PNS

Answer 6

Somatic Nervous System (SNS)

Automatic (Autonomic) Nervous System (ANS)

Question 7

Divisions Of SNS

Answer 7

Somatic Afferent (Sensory) Division
Somatic Efferent (Motor) Division

Question 8

Somatic Afferent Division

Answer 8

Receives Sensory Info & Conveys It To CNS Via Nerves

Question 9

Somatic Efferent Division

Answer 9

Regulates Contraction Of Skeletal Muscles Via Neuronal Pathways From CNS To Lower Motor Neurons

Question 10

ANS

Answer 10

Consists Of Sensory & Motor Neurons That Conduct Impulses To Smooth & Cardiac Muscles & Glands
(Involuntary)

Question 11

Motor Portion Of ANS

Answer 11

Sympathetic Division

Parasympathetic Division

Question 12

3 Parts Of Neurons

Answer 12

Cell Body
Dendrites
Axon

Question 13

Neurotubles

Answer 13

Function in the intracellular transport of proteins and other substances, in both directions between the cell body and the other ends of the processes

Question 14

Neurofilaments

Answer 14

Provide a skeletal framework for the axon

Question 15

Dendrites

Answer 15

Thread-like projections which are actually extensions of the cell body
Conduct nerve impulses towards the cell body

Question 16

Axons

Answer 16

Neuron Generally Has Just One Which Extends From Cell Body
Carries nerve impulses away from cell body to next neuron, muscle cell, or gland
Originates From Axon Hillock

Question 17

Initial Segment

Answer 17

Site Where Action Potential Is Initiated

Lies Immediately After Axon Hillock

Question 18

Collateral Branches

Answer 18

Side Processes That Axons May Possess

Question 19

Telodendria

Answer 19

Spray Of Small Axon Branches Which End In Tiny Swellings Called “End Bulbs”

Question 20

The Synapse

Answer 20

Junction Between End Bulb Of One Axon & Another Neuron, Muscle, Or Gland
Site Where Info. Is Transferred

Question 21

Neurolemmocyte

Answer 21

(Schwann Cells)

Form myelin sheaths around axons in the PNS

Question 22

Oligodendrocyte

Answer 22

Form myelin sheaths in the CNS

Question 23

Myelin

Answer 23

Layers Of A Lipid Sheath Covering Axons

Segmented

Question 24

Neurilemma Sheath

Answer 24

Outer Layer Of Myelin

Question 25

Nodes Of Ranvier

Answer 25

Gaps Between Myelin Sheaths

Question 26

Internode

Answer 26

Distance Between A Node Of Ranvier & The Next Node

Question 27

Multipolar Neurons

Answer 27

Many Dendrites & Single Axon

Question 28

Bipolar Neurons

Answer 28

Single Dendrite & Axon

Conducts Action Potentials To CNS

Question 29

Unipolar Neurons

Answer 29

Only Have One Axon

Peripheral Ends Have Dendrite-like Processes