Nervous System

Nervous
System

Nervous Tissue

Nervous tissue is found in the brain, spinal cord and peripheral nerves.

Your cells are called neurons

Multiple Select

Where can you find nervous tissue?

• Arm

• Hair

• Brain

• Spinal Cord

Parts of a neuron

Cell Body has 2 extensions
Dendrites which receive input
Axons- send information away from
the cell as an impulse

Cell Body is surrounded by
neuroglia

The small spaces between the
neuron and the cell it is
communicating is called the synapse

Cell Body

Dendrites

Axon

Dendrites

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Axon sends

away from the cell

Fill in the Blanks

Dendrite recieves

Role of Neurons

-Neurons are the functional units of the
nervous system

-Responsible for conducting the electrical
impulses that are sent in reaction to
changes in the body’s environment

-This is how neurons communicate with
one another and surrounding cells

-The small spaces between the neuron and the
cell it is communicating is called the synapse

-

Multiple Choice

the role of the neuron is to

choose the best answer

• conduct electrical impulses

• conduct impulses caused by stimuli from the external environment

• communicate a an impulse from the environment with other cells

• relay an electrical impulse in reaction to change in environment with other cells

Organs of the Nervous System

Central Nervous System (CNS) - consists of the brain and
spinal cord

Peripheral Nervous System (PNS) consist of the the nerves
that connect the CNS to the rest of the body parts

1.Sensory Receptors converts the environmental
information into impulses

2.Those impulses are conducted through
peripheral neurons all the way to the central
nervous system

3.This is then integrated to create a memory or a
thought to perceive the sneation the body is
feeling

4. Then a motor function is enacted in reaction to that thought

Multiple Choice

What is the order of the pathway of stimuli to action?

1. Peripheral Neurons

2. Central Nervous System

3. Sensory Receptors

4. Motor Functions

• 1. Sensory Receptors

  2. Peripheral Neurons

  3.Central Nervous System

  4. Motor Functions

• 1. Sensory Receptors

  2. Peripheral Neurons

  3.Motor Functions

  4.Central Nervous System

• 1.Central Nervous System

  2. Peripheral Neurons

  3.Sensory Receptors

  4. Motor Functions

• 1.Central Nervous System

  2.Sensory Receptors 3.Peripheral Neurons

  4. Motor Functions

Multiple Choice

Peripheral Nervous System consists of

Choose best answer

• body parts that connect to CNS

• peripheral nerves found in body parts that are connected to the CNS

• sensory receptors that react to environment changes which elicit a motor function

• sensory receptors

  neurons

  synapses

  electrical impulses

Multiple Select

Central Nervous System consists of

• Peripheral Nerves

• Brain

• Spinal Cord

• any body part

• any body part

Peripheral Nervous System

Motor functions can be divided
into two categories

-Voluntarily control which
somatic nervous system,
skeletal muscle

-Involuntary which
autonomic nervous system
such as cardiac and smooth
muscle.

-Your body detects and
responds to stimuli and
counteracts the effects to help
maintain homeostasis.

Multiple Choice

Involuntary actions of your nervous system is ________

It involevs ________ muscle

• Autonomic Nervous System

  skeletal muscle

• Autonomic Nervous System

  cardiac and smooth muscle

• Somatic Nervous System

  skeletal muscle

• Somatic Nervous System

  cardiac and smooth muscle

Multiple Choice

Voluntary actions of your nervous system is ________

It involevs ________ muscle

• Autonomic Nervous System

  skeletal muscle

• Autonomic Nervous System

  cardiac and smooth muscle

• Somatic Nervous System

  skeletal muscle

• Somatic Nervous System

  cardiac and smooth muscle

Types of Neuroglia

1.Microglial cells- are scattered throughout the
central nervous system

-Support neurons, phagocytize bacterial
cells and debris

2.Oligodendrocytes- align along the axons which
provide the insulated layers around the axon
called myelin sheath within the brain and spinal
cord

3.Astrocytes- found between neurons and blood
vessels, they provide structural support and
regulate nutrients for growth

-Also form scar tissue if injury occurs in the
CNS

4.Ependymal cells- epithelial-like membrane that
covers specialized brain parts

Multiple Choice

Microgial

where is it found and what does it do

• found in the brain

  cvers specialized brain parts

• CNS

  removes cell debris

• found on the axons

  creates the myelin sheath

• between neurons and blood vessels

  structural support and nutrients

Multiple Choice

Oligodendrocytes

where is it found and what does it do

• found in the brain

  cvers specialized brain parts

• CNS

  removes cell debris

• found on the axons

  creates the myelin sheath

• between neurons and blood vessels

  structural support and nutrients

Multiple Choice

Astrocytes

where is it found and what does it do

• found in the brain

  cvers specialized brain parts

• CNS

  removes cell debris

• found on the axons

  creates the myelin sheath

• between neurons and blood vessels

  structural support and nutrients

Multiple Choice

Ependymal cells

where is it found and what does it do

• found in the brain

  cvers specialized brain parts

• CNS

  removes cell debris

• found on the axons

  creates the myelin sheath

• between neurons and blood vessels

  structural support and nutrients

Homeostasis

Homeostasis is how you rboyd responds to stimuli from your external environment

Mechanisms involve are
1.Receptors- receive the stimuli and perceive it

2.

Set Point- tells what they oyd should be at

3.

Effectors-response and alters condition in the internal environment

There are two type of feedback loops.

Negative feedback loop which is you body responding to counter the stimuli that is
perceived

Positive feedback loop which your body will continue a response to a stimuli until the stimuli
is gone

Fill in the Blanks

Negative feedback loop will illicit

response to a stimuli from the external environment

Negative Feedback Loop

Positive Feedback Loop

Fill in the Blanks

Positive feedback loop will continue a response until the stimuli is

Fill in the Blanks

If the axon in CNS is myelinated it is

matter.

Fill in the Blanks

If the axon in CNS is unmyelinated it is

matter.

Multiple Choice

What neuroglia makes the myelin sheath in Axons in the CNS?

• Oligodendrocytes

• Schwann Cells

• Astrocytes

• Epydenmal cells

Multiple Choice

What neuroglia makes the myelin sheath in Axons in the Peripheral Neurons?

• Oligodendrocytes

• Schwann Cells

• Astrocytes

• Epydenmal cells

Fill in the Blanks

Nodes of Ranvier are the parts where there is no

Multiple Choice

Bipolar are ?

Found where?

• Many dendrites only one axon

  found in the ears nose eyes

• one dendrite

  one axon

  found in eyes, nose and ears

• many dendrites only one axon

  found brain and spinal cord

• branched axon whihc serves as dendrite and connection to brain

Multiple Choice

Unipolar are ?

Found where?

• Many dendrites only one axon

  found in the ears nose eyes

• one dendrite

  one axon

  found in eyes, nose and ears

• many dendrites only one axon

  found brain and spinal cord

• branched axon whihc serves as dendrite and connection to brain

Multiple Choice

Multipolar Neurons are ?

Found where?

• Many dendrites only one axon

  found in the ears nose eyes

• one dendrite

  one axon

  found in eyes, nose and ears

• many dendrites only one axon

  found brain and spinal cord

• branched axon whihc serves as dendrite and connection to brain

Multiple Choice

Sensory Neurons

• conduct impulses to muscles or glands fomr the bian or spinal cord

• found in brain or spinal cord

  multipolar

• conduct impusle from external stimular

  unipolar some bipolar

Multiple Choice

Motor Neurons

• conduct impulses to muscles or glands fomr the bian or spinal cord

• found in brain or spinal cord

  multipolar

• conduct impusle from external stimular

  unipolar some bipolar

Multiple Choice

InterNeurons

• conduct impulses to muscles or glands fomr the bian or spinal cord

• found in brain or spinal cord

  multipolar

• conduct impusle from external stimular

  unipolar some bipolar

Multiple Choice

Presynaptic neuron

• the gap between

• sender of impulse

• reciever of impulse

• impulse jumping the gap

Multiple Choice

Postsynaptic neuron

• the gap between

• sender of impulse

• reciever of impulse

• impulse jumping the gap

Multiple Choice

Synaptic transmission neuron

• the gap between

• sender of impulse

• reciever of impulse

• impulse jumping the gap

Multiple Choice

Synaptic cleft is

• the gap between

• sender of impulse

• reciever of impulse

• impulse jumping the gap