Intro to Nervous System

Question 1

What is the nervous system responsible for?

Answer 1

receiving and processing impulses from the external or internal environments, and initiating an appropriate response

Question 2

What are the 2 parts of the nervous system (structural)?

Answer 2

central nervous system (CNS)

peripheral nervous system (PNS)

Question 3

What are the 3 parts of the nervous system (functional)?

Answer 3

somatic nervous system
visceral (autonomic) nervous system
enteric nervous system

Question 4

What do sensory/afferent nerve fibers do?

Answer 4

carry signals towards CNS

Question 5

What do motor/efferent nerve fibers do?

Answer 5

carry signals away from CNS

Question 6

Describe the overlap between the structural and functional classifications of the nervous system.

Answer 6

parts of somatic and visceral (autonomic) systems are contained within CNS, and other parts are included in the PNS

Question 7

What structures does the CNS consist of?

Answer 7

brain and spinal cord

Question 8

What is the function of the CNS?

Answer 8

integrative and control centres

Question 9

What structures does the PNS consist of?

Answer 9

cranial nerves and spinal nerves

Question 10

What is the function of the PNS?

Answer 10

communication lines between CNS and rest of body

Question 11

What are the 2 divisions of the PNS?

Answer 11

sensory (afferent) division

motor (efferent) division

Question 12

What structures does the sensory (afferent) division of the PNS consist of?

Answer 12

somatic and visceral sensory nerve fibers

Question 13

What is the function of the sensory (afferent) division of the PNS?

Answer 13

conducts impulses from receptors to CNS

Question 14

What structures does the motor (efferent) division of the PNS consist of?

Answer 14

motor nerve fibers

Question 15

What is the function of the motor (efferent) division of the PNS?

Answer 15

conducts impulses from CNS to effectors (muscles and glands)

Question 16

What are the 2 parts of the motor (efferent) division of the PNS?

Answer 16

somatic nervous system

autonomic nervous system (ANS)

Question 17

What structures does the somatic nervous system consist of?

Answer 17

somatic motor (voluntary)

Question 18

What is the function of the somatic nervous system?

Answer 18

conducts impulses from CNS to skeletal muscles

Question 19

What structures does the autonomic nervous system consist of?

Answer 19

visceral motor (involuntary)

Question 20

What is the function of the autonomic nervous system?

Answer 20

conducts impulses from CNS to cardiac muscles, smooth muscles, and glands

Question 21

What are the 2 divisions of the autonomic nervous system (ANS)?

Answer 21

sympathetic division

parasympathetic division

Question 22

What is the function of the sympathetic division of the ANS?

Answer 22

mobilizes body systems during activity

Question 23

What are the functions of the parasympathetic division of the ANS? (2)

Answer 23

• conserves energy

- promotes housekeeping functions during rest

Question 24

Where do sensory/afferent nerve fibers carry signals? (3)

Answer 24

from

• sensory (afferent) division of PNS
• skin
• stomach

→ CNS

Question 25

What are somatic sensory fibers?

Answer 25

sensory/afferent nerve fibers that carry signal from skin to CNS

Question 26

What are visceral sensory fibers?

Answer 26

sensory/afferent nerve fibers that carry signal from stomach to CNS

Question 27

Where do motor/efferent nerve fibers carry signals?

Answer 27

from CNS → - PNS (and through all parts/divisions) - skeletal muscle - heart - bladder

Question 28

What are motor fibers of the somatic nervous system?

Answer 28

motor/efferent nerve fibers that carry signal from CNS to skeletal muscle

Question 29

What are sympathetic motor fibers of the ANS?

Answer 29

motor/efferent nerve fibers that carry signal from CNS to heart

Question 30

What are parasympathetic motor fibers of the ANS?

Answer 30

motor/efferent nerve fibers that carry signal from CNS to bladder