Download Respiratory System

Respiratory System
Exchanges gases in the lungs.
The respiratory system is made up of :

Lungs

Throat

Passageways that lead to the lungs
Breathing
• Involves inhaling, exhaling, and gas exchange
The parts of the respiratory system used in breathing include :
1.
2.
3.
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.
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).
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
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
April 28th
1. Write down your homework:
• Page 9-15 in packet
• Flashcards for Circulatory and Respiratory
2. Get out your homework.
3. Quiz 3 will be Thursday. Circulatory and
Respiratory systems
trachea
bronchial tube
right lung
left lung
Your
Lungs
pg 9-14
pleura
bronchiole
capillaries
alveoli
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)
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.
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.
Gas Exchange
in
Alveoli
It’s 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.
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.
Inhale
Oxygen
Exhale
Carbon dioxide
Contracted diaphragm
Breastbone
Lung
Spine
Relaxed diaphragm
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 York:2001
Videos were obtained from www.unitedstreaming.com