Ch8 Nervous System

Question 0

Division of nervous system

Answer 0

Central-brain and spinal cord

Peripheral-cranial and spinal nerves

Question 1

Function of Nervous system

Answer 1

Coordination and control of body
Detect changes
Organize info

Question 2

Somatic

Answer 2

Skeletal

Question 3

Autonomic

Answer 3

Smooth muscle
Cardiac muscle
Glands

Question 4

Structure of neuron

Answer 4

Cell body-nucleus and organelles
Dendrites-receive impulses,carry impulses to cell body and axon
Axon-long,thin, carry impulses away from cell body or dendrites
Myelin sheath-insulates axons,increases speedof impulse transmission
Nodes of ranvier lack myelin and are placed where axon is exposed

Question 5

3 types of neurons

Answer 5

Sensory
Interneurons
Motor

Question 6

Neuroglia

Answer 6

Support and protect neurons

More numerous than neurons

Question 7

Neuron characteristics

Answer 7

Irritability-respond to stimulus by forming impulse

Conductivity-transmit impulse along neuron to another cell

Question 8

Resting potential

Answer 8

Na+ outside
K+,po4-3,so4-2 inside
Polarized

Question 9

Impulse formation

Answer 9

All or none response

Question 10

Threshold stimulus

Answer 10

Needed to activate neuron

Question 11

When activated by stimulus

Answer 11

Na+ in
Positive and negative equal on both sides of membrane
Depolarized-action potential
3so
2pin

Question 12

Repolarization

Answer 12

K out
Na out
K+ in to reestablish resting state

Question 13

Impulse conduction

Answer 13

Impulses only form in membrane exposed at nodes of ranvier

Question 14

Synapse

Answer 14

Junction of axon with another neuron

Question 15

Meninges

Answer 15

Three fibrous membranes
Separate cns and bone
Protect brain/spine

Question 16

Csf- cerebrospinal fluid

Answer 16

Shock absorber for brain

Question 17

4 major parts of brain

Answer 17

Cerebrum
Cerebellum
Diencephalon
Brain stem

Question 18

Cerebrum

Answer 18

Largest part of brain
Sensations
Voluntary actions
Reasoning 
Planning

Question 19

Left side of brain

Answer 19

Analytical

Question 20

Right side of brain

Answer 20

Musical

Question 21

Diencephelon

Answer 21

Thalamus

Hypothalamus

Question 22

Hypothalamus

Answer 22

Controls pituitary gland

Homeostasis

Question 23

Limbic system

Answer 23

Thalamus and diencephelon

If malfunctions it can result in mood disorder

Question 24

Brain stem

Answer 24

Connects brain to spinal cord
Midbrain-head,eye,body movement
Pons-breathing
Medulla oblongata-respiratory control, cardiac control,blood pressure

Question 25

Cerebellum

Answer 25

Outer layer of gray matter surrounding inner white matter
Controls skeletal muscles
Posture,balance,muscle coordination

Question 26

Csf is produced by what

Answer 26

Choroid plexuses

Question 27

Structure of spinal cord

Answer 27

Has grooves
31 pairs spinal nerves
Gray and white matter

Question 28

Function of spinal cord

Answer 28

Transmit impulses to and from brain

Reflex center for spinal reflexes

Question 29

Peripheral nervous system

Answer 29

Cranial and spinal nerves

Question 30

3 types of nerves

Answer 30

Motor
Sensory
Mixed

Question 31

Reflexes

Answer 31

Rapid, involuntary responses to internal and external stimuli
Maintain homeostasis

Question 32

Reflex arcs

Answer 32

Reflex pathway

Doesn’t need brain to react

Question 33

Autonomic reflex

Answer 33

Involuntary
Smooth muscle
Cardiac muscle
Unconscious level

Question 34

Somatic reflexes

Answer 34

Voluntary
Skeletal muscle
Conscious awareness