The Nervous System

Question 1

Functions of the nervous system

Answer 1

To transmit info from one part of the body to another and coordinates and controls body functions

Question 2

Divisions of the nervous system

Answer 2

Central nervous system and peripheral nervous system

Question 3

Central N.S

Answer 3

the brain and spinal cord

Question 4

Peripheral N.S

Answer 4

Nerves that extend to the parts of the body

Question 5

Cells of the nervous systems

Answer 5

Neurons and glia

Question 6

Types of neurons

Answer 6

Sensory, motor, and inter neurons

Question 7

Sensory neurons

Answer 7

(Afferent) transmit impulses toward the spinal cord and brain

Question 8

Motor neurons

Answer 8

(Efferent) transmit impulses toward the body

Question 9

Inter neurons

Answer 9

Directly connect sensory and motor neurons in the spinal

Question 10

The synapse

Answer 10

Tiny space between the axon of one neuron and the dendrites of another

Question 11

Dendrites

Answer 11

Receive impulses (tree like)

Question 12

Axon

Answer 12

Send impulses away (covered in myelin)

Question 13

Myelin

Answer 13

Fatty substance covering Schwann cells (like the rubber on the wire)

Question 14

Nodes of Ranvier

Answer 14

The stuff between the Schwann cells

Question 15

Dopamine

Answer 15

Stuff that create neurotransmitters

Question 16

Endorphin

Answer 16

Block the impulse

Question 17

Neurotransmitters

Answer 17

Chemical “bridges”, flood the space (are released by pre-synaptic neuron)

Question 18

Brain stem

Answer 18

Controls vital functions

• heartbeat
• breathing
• blood pressure

Question 19

Brain stem has three parts

Answer 19

Medulla oblongata
Pons
Midbrain

Question 20

Diencephalon

Answer 20

Interior center of the brain

Question 21

Hypothalamus

Answer 21

Controls: -body temp

• sleep cycle
• appetite
• sexual arousal

Question 22

Thalamus

Answer 22

• Relays sensory impulses to the appropriate part of the brain
• associates sensations with emotions

Question 23

Cerebellum

Answer 23

Controls coordination of movement, balance, and equilibrium

Question 24

Cerebrum

Answer 24

Largest upper most part of the brain

• thinking part
• perception
• emotions
• memory

Question 25

Spinal cord

Answer 25

About 17-18 inches long
Extends from occipital bone to L1
Provides two way communication

Question 26

Two ways of communication what are they

Answer 26

Ascending tracts conduct impulses up the cord to brain

Descending tracts conduct impulses down the cord from brain

Question 27

Meninges

Answer 27

Tough, fluid filled membrane cover ing brain and spine made of three layers

Question 28

Layers of meninges

Answer 28

Dura-tough outer layer (next to bone)
Arachnoid-fluid fills spaces (cobweb)
Pia-directly touching brain

Question 29

Cerebrospinal fluid

Answer 29

Bathes the brain and spinal cord
Acts as a shock absorber
Continually produced

Question 30

Spinal nerves

Answer 30

31 pairs

Have sensory and motor functions

Question 31

Cranial nerves

Answer 31

12 pairs

Question 32

Autonomic nervous system

Answer 32

Motor neurons that conduct impulses to the heart, smooth, muscles and glands of the body

Question 33

2 branches of autonomic nervous system

Answer 33

Parasympathetic- controls involuntary muscles during normal every day conditions
Sympathetic- controls involuntary muscles during stressful or emergency conditions