Organization of the Nervous System

Question 1

Sensory (Afferent) Division

Answer 1

sends impulses from the senses to the CNS

Question 2

Peripheral Nervous System (PNS)

Answer 2

consists of nerves other than brain and spinal chord

Question 3

Central Nervous System (CNS)

Answer 3

Consists of brain and spinal chord

Question 4

Motor (Efferent) Division

Answer 4

Sends impulses from the CNS to the muscles and glands

Question 5

Autonomic Nervous System

Answer 5

Involuntary muscle control

Question 6

Somatic Nervous System

Answer 6

Voluntary muscle control

Question 7

Sympathetic Division

Answer 7

Used in emergency situations (fight or flight)

Question 8

Parasympathetic Division

Answer 8

Reduces sympathetic response and provides resting functions such as digestion and urination

Question 9

Dendrites

Answer 9

Receive the nerve impulses from the senses or another nueron

Question 10

Axon

Answer 10

Passageway for nerve impulse after cell body; end in axon terminals

Question 11

Myelin sheath

Answer 11

Insulates the axon, produced by the Schwann cells

Question 12

Cell body

Answer 12

contains the nucleus; transmits impulse to the axon

Question 13

Nodes of Ranvier

Answer 13

Gaps in the myelin sheath

Question 14

Unipolar nuerons

Answer 14

have one process (rapid signals)

Question 15

Bipolar nuerons

Answer 15

have two processes (send/receive)

Question 16

Multipolar nuerons

Answer 16

have many processes (usually several dendrites and one axon)

Question 17

Astrocytes

Answer 17

support and anchor neurons to surrounding capillaries

Question 18

Microglia

Answer 18

Provides immune response to CNS

Question 19

Ependymal cells

Answer 19

secrete and circulate cerebrospinal fluid

Question 20

Oligodendrocytes

Answer 20

Provide myelin insulation to neurons in the CNS

Question 21

Satellite cells

Answer 21

Support and anchor neurons in the PNS