Human Organ Systems

1
Human Organ Systems

• The Respiratory System

2
Function

• The respiratory systems main job is gas exchange.
• The respiratory system supplies your body with
  oxygen needed for respiration.
• The respiratory system also works to remove CO2
  gas.

3
Function cont.

• Your respiratory works with other organ systems
  to help you maintain homeostasis.
• Digestive and Circulatory Respiratory system
  works with these two systems to provide the raw
  materials for cellular respiration.
• Excretory system The respiratory system aids in
  the removal of metabolic wastes CO2 and H2O

4
Components

• Nose Nose is the primary entry and exit site of
  gases in the body. Mucous and Cilia (fine
  hairs) help to moisten and filter the air you
  breath.
• The air is also warmed as it passes through your
  nasal passageways.
• Mouth Secondary entry and exit site for gases.
  Important especially during physical exertion
  when the body needs more O2 and is producing more
  CO2.

5
Pharynx, Larynx and Trachea

• Once the air leaves your nose or mouth, it next
  travels into your Pharynx (Throat).
• The air then travels past a protective flap on
  tissue called the epiglottis, and the air passes
  through your larynx (Voicebox)
• Next the air passes into your trachea (windpipe)
• The trachea carries the air into your lungs.

6
Lungs

• Another important component of the respiratory
  system are the lungs.
• The lungs are lobed air sacs that are found in
  the thoracic cavity.
• The right lung has 3 lobes, the left lung has 2.
• They are surround by a thin membrane called the
  Pleura.

7
Air vessels

• You trachea splits off into two large air tubes
  called the left and right Bronchi.
• The bronchi branch off to form smaller tubules
  called bronchioles
• The bronchioles get even smaller and end up in
  small grapelike bundles called alveoli.
• It is at the alveoli that gas exchange occurs.

8
A two-way street

• Unlike your digestive system, your respiratory
  system only one point of entry and exit.
• Air flows into your body is this order.
• Nose or mouth ? Pharynx ? Larynx ? Trachea ?
  left or right bronchi ? bronchioles ? Alevoli.
• It leaves your body through the same structures
  just in reverse order.

9
Air pressure

• The air flows into and out of your lungs due to
  differences in air pressure inside and outside
  your lungs.
• Every breath you take has two components, an
  inhalation, and an exhalation.
• Inhalation requires energy while exhalation does
  not.

10
I never inhaled B. Clinton

• When you inhale, a large muscle located at the
  bottom of your lungs called the diaphragm
  contracts.
• When the diaphragm contracts, it pulls downward
  on your lungs, causing them to increase in
  volume.
• As volume is increased, the air pressure inside
  you lungs decreases.
• The air moves from high pressure (outside) to low
  pressure (inside)

11
Waiting to exhale

• When you relax your diaphragm it allows the lungs
  to go back to their relaxed state.
• The lungs lose volume which causes the air
  pressure to increase.
• This increase in air pressure causes the air in
  your lungs to be forced out of your body.

12
Breathing summary

• Inhalation Volume of lungs increases, air
  pressure decreases, air flows in.
• Exhalation Volume of lungs decreases, air
  pressure increases, air flows out.
• Also aiding in this process are muscles between
  your ribs called intercoastals.
• The intercoastals help increase the volume of
  your lungs by expanding the rib cage during
  inhalation.

13
Video

• Lets watch a short video that will give us a good
  look at what happens everytime we breathe in, and
  breathe out.
• Respiratory system video