Respiratory System

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Respiratory System
Exchanges gases in the lungs.
The respiratory system is made up of

• Lungs
• Throat
• Passageways that lead to the lungs

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Breathing

• Involves inhaling, exhaling, and gas exchange

The parts of the respiratory system used in
breathing include

• Nose and mouth - Where air enters and leaves the
  body.
• Throat (pharynx) - Where air, food and drink
  travel. Branches into two tubes (one for air and
  one for food).
• Voice box (larynx) - Air flow between vocal
  cords produces sound.

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• 4. Windpipe (trachea) - Tube that carries air
  from throat to lungs.
• 5. Bronchi - Trachea splits to form two tubes
  (one for each lung).
• 6. Lungs - Soft tissue where gas exchange occurs
• 7. Bronchioles - thousands of tiny tubes inside
  lungs
• 8. Alveoli - surrounded by capillaries.
  Exchanges carbon dioxide (CO2) and oxygen (O2).

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Respiration

• The entire process by which the body takes in
  and uses oxygen and removes carbon dioxide and
  water.

Respiration takes place in two parts

• Breathing

• Cellular Respiration

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Parts of the Respiratory System
Throat (Pharynx)
Voice box (Larynx)
Wind pipe (Trachea)
Bronchioles
Bronchi
Lung
Alveoli
The diaphragm is the muscle under your lungs that
allows the lungs to expand and contract.
Diaphragm
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April 28th

• Write down your homework
• Page 9-15 in packet
• Flashcards for Circulatory and Respiratory
• Get out your homework.
• Quiz 3 will be Thursday. Circulatory and
  Respiratory systems

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trachea
bronchial tube
right lung
left lung
Your Lungs pg 9-14
pleura
bronchiole
capillaries
alveoli
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How do we Breathe?

• The lungs do not contain muscles to move air in
  and out
• Rib muscles and the diaphragm are needed to move
  air in and out of the body.

• Inhaling When we breathe in we take in oxygen.
• The diaphragm contracts and moves down
  (increasing chest volume)
• The rib muscles contract, the rib cage moves up.
  (air rushes in)

• Exhaling When we exhale we release carbon
  dioxide.
• The diaphragm relaxes and moves up. (decreasing
  chest volume)
• The rib muscles relax, the rib cage moves down.
  (forcing air out)

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Need for Oxygen
Once the oxygen has reached the lungs, it needs
to enter the blood stream. Why?
Every cell in our body needs oxygen to make
energy.
Inside the alveoli, which are surrounded by
capillaries, gases are exchanged between the
lungs and the blood.
Think back to the circulatory system.
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Gas Exchange in Alveoli.

• Oxygen leaves the alveoli (lungs) and enters the
  capillaries (red blood cells) to be transported
  throughout the body.
• Carbon dioxide leaves the capillaries (red blood
  cells) and enters the alveoli (lungs) to be
  exhaled.

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Gas Exchange in Alveoli
Its like the Raging River at The Great Escape!
You are dry or oxygen molecules waiting to get
on the ride. The tubes are red blood cells. To
get on you have to wait for wet or carbon
dioxide molecules to get off. Then you can enjoy
the ride.
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Why is the circulatory system important to the
respiratory system?

• The circulatory system carries oxygen and carbon
  dioxide throughout the body.
• Oxygen is needed by cells to make energy
  (cellular respiration).
• Carbon dioxide is a waste product of cellular
  respiration that must be removed from the body.

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Inhale
Oxygen
Exhale
Carbon dioxide
Contracted diaphragm
Breastbone
Lung
Spine
Relaxed diaphragm
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Resources for pictures and video
1. www.oup.co.uk/images/oxed/children/
yoes/humans/lungs.jpg 2. www.mamashealth.com/
images/lungs1.gif 3. www.scdhec.net/eqc/baq/
images/alveoli.jpg 4.http//users.tpg.com.au/users
/amcgann/body/respiratory/alveoli.jpg 5. Human
Body. Ann Baggaley (ed) Dorling Kindersley
Publishing, Inc. New York2001 Videos were
obtained from www.unitedstreaming.com