8/3/2019 Respiratory System Article

1/4

I N S I D E T H I S

I S S U E :

Simple things about my

body buddies

1

Structure of alveoli 1

Mechanism of breath-

ing

2

Partial pressure of O2

and CO2 in body

3

Extravaganza brain 2

3

ATTENTION !!! 4

INSIDE THE HUMAN BODY:

THE RESPIRATORY SYSTEM

S P E C I A L F A C T

A B O U T M E ! !

I am better known

as oxygen delivery

system

Heart + lung = sib-

ling

The average adult's

lungs contain about

600 million of alve-

oli, that are

surrounded by cap-

illaries.

Hi!

I'm the Profess AIR. I want to introduce you to

two of my best friends; my HEARTand LUNGS.

They have been working together, for me, for

many, many, many years now. I try to take very

good care of these body buddies because they

have been so good to me.

Please come along with me as I take you on a trip

into my body where we can all learn what makes

my heart and lungs my best friends.

MONDAY, 14th FEBRUARY 2011

THE HEART AND LUNGS ARE MY BODY BUDDIES

Respiratory system operates in conjunction with circulatory system

In the alveoli there is a net movement of oxygen into the blood

and carbon dioxide out of the blood into the alveoli. There are

wonderful characteristics about alveoli that allow efficient

gases exchange.

1. The alveoli is constructed of a very thin layer of cells to

allow rapid diffusion of the gases.

2. They are surrounded by capillaries to bring them in contact

with the blood.

3. They are small anve very numerous allowing for a large

surface area to facilitate diffusion.

Writer : Sumayah

8/3/2019 Respiratory System Article

2/4

The primary function of the respiratory system is to supply the blood

with oxygen in order for the blood to deliver oxygen to all parts of the body

HOW DO WE BREATH??

Did you know .

Respiratory system is

achieved through the

mouth, nose., trachea,

lungs and diaphragm..

My brain is a veryimportant part of mybreathing. My lungs

take orders from mybrain, telling me tobreathe! My braindoes this for me evenwhen I'm sleeping!

Actually.When we breathe, we inhale oxygen and exhale carbon dioxide. This

exchange of gases is the respiratory system's means of getting oxygen to the blood.

Pathways of respiratory system

Air enternostril

The nasopharynx

The oral pharynx

The glottis

The trachea

The bronchi

The bronchioles

The alveoli

Important

The Mechanics Of Breathing

Lets generate ourknowledge:

What do you miss out if

you breath through

your mouth instead?

What force actually

causes the lung to inflate

or deflate?

Inhalation Exhalation

Diaphragm

Thoracic cavity

Air pressure in

lung

Movement of

ribcage

Moves down-

ward

Increase

Lower

Up and out

Moves upward

Decrease

Increase

Down and in

Writer : Sharlida

PAGE 2

8/3/2019 Respiratory System Article

3/4

P A G E

P A R T I A L P R E S S U R E O F O 2 A N D C O 2 I N B O D Y

I breathe to stay alive. Without air, mybody would stop working in only a few

minutes. Oops! Don't forget to let that aiout.

It's really amazing! I breathe about 20 time

every minute. Each breath is about a cupful

air. This means 20 cups every minute! If I'm

running around it could be as much as a

hundred cups of air that goes in and out of m

lungs. Imagine how much air I use in one da

It's no wonder I want to breathe clean air.

Up your

volume info!!

Partial Pressures of O2 and CO2 in the body(normal, resting conditions):

Alveoli

PO2 = 100 mmHgPCO2 = 40 mmHg

Alveolar capillaries - Entering the alveolar capillariesPO2 = 40 mmHg (relatively low because this blood has just returned from the

systemic circulation & has lost much of its oxygen)

PCO2 = 45 mmHg (relatively high because the blood returning from the sys

temic circulation has picked up carbon dioxide)

Leaving the alveolar capillaries

PO2 = 100 mm Hg

PCO2 = 40 mm Hg

Entering the systemic capillariesPO2 = 100 mm Hg

PCO2 = 40 mm Hg

Body cells (resting conditions)

PO2 = 40 mm Hg

PCO2 = 45 mm Hg

Leaving the systemic capillaries

PO2 = 40 mm Hg

PCO2 = 45 mm Hg

Blood leaving the systemic capillaries returns to the heart (right atrium) via venules &

veins (and no gas exchange occurs while blood is in venules & veins). This blood is

then pumped to the lungs (and the alveolar capillaries) by the right ventricle.

How are oxygen & carbon dioxide

transported in the blood?

Oxygen is carried in blood:

1 - bound to hemoglobin (98.5% of

all oxygen in the blood)

2 - dissolved in the plasma (1.5%)

Intra-alveolar pressure duringinspiration & expiration

Writer : Hamidah

http://www.wisc-online.com/objects/index_tj.asp?objID=AP2404http://www.wisc-online.com/objects/index_tj.asp?objID=AP2404http://www.wisc-online.com/objects/index_tj.asp?objID=AP2404http://www.wisc-online.com/objects/index_tj.asp?objID=AP2404http://www.wisc-online.com/objects/index_tj.asp?objID=AP2404http://www.wisc-online.com/objects/index_tj.asp?objID=AP2404http://www.wisc-online.com/objects/index_tj.asp?objID=AP2404

8/3/2019 Respiratory System Article

4/4

Not everyone treats his or her lungs nicely. Smoking can makeyour heart and lungs very sick. Smoke causes the blood vessels

to become plugged. It stops the lungs from cleaning out thedirt in the air. It also makes your heart

work harder!

I depend on my body buddies every minute of my life! I don'twant to hurt them by smoking!

TOBACCO

Smoking is the biggest cause of preventable lung disease. Your

REMEMBER!!!

My heart and lungs work better

with practice, so I need to keep

exercising!

Swimming, running, or playing

catch are all fun things to do! And

guess what?! My heart and lungs

love it!

Oxygen wants to go to all parts of my body. In my blood, the oxygen catches a ride with a bus called a redblood cell. One teaspoon of blood would have about 25 million of these buses. It's usually pretty easy to get a

ride. It catches a ride with a red blood cell just like I catch a bus to go to school or to go downtown.

The buses deliver their oxygen "passengers" to all the cells in our body. Before oxygen can have a seat on the bus, how-

ever, another part of the air has to get off. Carbon dioxide, or CO2, is made in my cells. Big names for such little things.

Too much carbon dioxide can be poisonous so I have to get rid of it. I just send it to my lungs. It leaves the bus as the

blood goes through the lungs and jumps into an air sac. Now I can breathe these poisons out! That's a relief.

"Smoking, You're Joking"

I hope you have listened very carefully and have learned that your

heart and lungs, your body buddies, are very special!

Well, so long for now. Remember: if you take care of your body bud-

dies, they will take really good care of you!

Bye bye my friends!

P A G E 4

http://www.lung.ca/children/games/smoking_youre_joking/smoking_youre_joking1_3.htmlhttp://www.lung.ca/children/games/smoking_youre_joking/smoking_youre_joking1_3.htmlhttp://www.lung.ca/children/grades4_6/tobacco/index.htmlhttp://www.lung.ca/children/games/smoking_youre_joking/smoking_youre_joking1_3.html