Nervous System Packet 1

Question 1

PNS includes

Answer 1

Cranial nerves
Spinal Nerves
Sensory receptors in skin

Question 2

CNS includes

Answer 2

Brain

Spinal cord

Question 3

Functions of of Nervous System

Answer 3

1. Sensory
2. Integrative
3. Motor

Question 4

Sensory function

Answer 4

• Collects internal/external stimuli through the use of sensory receptor
• Nerve impulses travel towards CNS along sensory neurons

Question 5

Integrative function

Answer 5

• Carried out by CNS
• Processes sensory information
• Sends messages to appropriate effector

Question 6

Motor function

Answer 6

• Generation of responses to initial stimuli
• Nerve impulses travel away from CNS along motor
• Neurons which lead to effectors throughout the body
effectors carry out the response

Question 7

Effector

Answer 7

A target such as muscle or organ

Question 8

Organization of Nervous System

Answer 8

PNS to CNS and back to PNS

Question 9

Neurons part of the PNS

Answer 9

Sensory and Motor Neurons

Question 10

Neurons part of the CNS

Answer 10

Interneurons (only in CNS)

Question 11

Afferent neuron

Answer 11

Sensory neurons that carry nerve impulses from sensory stimuli towards the CNS and brain

Question 12

Efferent neurons

Answer 12

Motor neurons that carry neural impulses away from CNS and towards muscles (effectors) to cause movement

Question 13

Neuron

Answer 13

nerve cell that conducts electrical impulses and release chemical messengers (neurotransmitters) to communicate with other cells

Question 14

Neurotransmitter

Answer 14

Chemical messengers made in the cell body and transported to synaptic end bulbs of a neuron to attach to effectors

Question 15

Cell body of a Neuron

Answer 15

Also called the soma contains organelles and makes neurotransmitters

Question 16

Clusters of cell bodies in PNS

Answer 16

Ganglia

Question 17

Clusters of cell bodies in CNS

Answer 17

Nuclei

Question 18

Dendrites

Answer 18

receiving ends of a neuron; receives signals from other neurons or from stimuli in the environment

Question 19

Axon

Answer 19

Transmits impulse away from the cell body

Question 20

Axon hillock

Answer 20

Area where impulses (action potentials) are initiated

Question 21

Nerve

Answer 21

A bundle of axons (from many neurons) plus connective tissue and blood vessels in the PNS

Question 22

Tract

Answer 22

A bundle of axons (from many neurons) plus connective tissue and blood vessels in the CNS

Question 23

Mixed nerves

Answer 23

Nerves that contain both sensory and motor fibers (axons)

Question 24

Why do some nerves contain both somatic and visceral fibers?

Answer 24

So messages somatic and visceral in nature can travel along the same path

Question 25

First-order neuron

Answer 25

When visceral and somatic are separate

Question 26

Second-order neuron

Answer 26

When two first-order neurons combine in the spinal cord and get sent to the brain

Question 27

Referred pain

Answer 27

Pain stimuli from visceral organs are perceived at a site other the place of origin