THE RESPIRATORY SYSTEM HCT II

The respiratory system

• Consists of lungs and air passages• Controlled through the medulla oblongata• Responsible for taking in oxygen and removing carbon dioxide

• Must work continuously or death will occur• The body has approximately a 4-6 minute supply of oxygen

Hi I am O2 ,you can call me oxygen, and I will be your guide today.

I advise you keep all feet and hands inside the ride at all times.

Respiratory Intro

You may be asking, what is the Respiratory system? Well, the Respiratory system is the system that helps you breath in and out, so oxygen (02) can be pumped through your body and carbon dioxide (CO2) can be removed from the blood stream. You must remember that the Respiratory system is made up of many different organs.

JH

Where are we?

Nasal Passage

Bronchi Tubes

Alveoli (air-sacs)

Thin-walled blood vessels called capillaries

Very thin cells line the alveoli so that O2 and CO2 can pass in and out of the blood.

Bronchioles pass air to and from your alveoli.

The Trachea is held open by partial rings of cartilage.

Tongue

PharynxHere We Go!!!

JH

This is where it all begins. This is where the oxygen first

enters your body and also where Carbon Dioxide leaves.

THE NOSE AND MOUTH

MB

The Nose and MouthWhen the air comes into your nose it gets

filtered by tiny hairs called cilia and it is moistened by the mucus that is in your nose. Mucus also helps to trap pathogens

Your sinuses also help out with your Respiratory System. They help to moisten

and heat the air that you breath.

Air can also get into your body through yourmouth/oral cavity but air is not filtered as

much when it enters in through your mouth.

MB

Nose and Mouth Picture

Nasal Cavity

Nostril

Oral CavityPharynx

Olfactory receptors for the sense of smell are located in the nose

Lacrimal ducts drain tears from the eye into the noseTo provide additional moisture for the air

Nasal Passage

Bronchi Tubes

Alveoli (air-sacs)

Thin-walled blood vessels called capillaries

Very thin cells line the alveoli so that O2 and CO2 can pass in and out of the blood.

Bronchioles pass air to and from your alveoli.

The Trachea is held open by partial rings of cartilage.

Tongue

Pharynx

Where are We?

We are here.

MB

THE PHARYNX AND TRACHEA

Next we will head down to your pharynx(throat) and your trachea (windpipe).This is where the air passes from your

nose to your bronchi tubes and lungs. As air leaves nose it enters the pharynxConsists of three sections

•Nasopharynx- upper portion behind nasal cavities, contains tonsils, adenoids and eustachian tube openings•Oropharynx- behind the mouth, receives air from the

nose and air and food from the mough•Laryngopharynx- bottom section, which branches into

trachea (windpipe) and the esophagus.

The Pharynx and Trachea

Your pharynx (throat) gathers air after it passes through your nose and then the air is passed down to

your trachea (windpipe). Carries air between your pharynx and bronchi

Your trachea is held open by “incomplete ringsof cartilage.” Without these rings your trachea might close off and air would not be able to get

to and from your lungs.

Pharynx

(Throat)

Mouth

Trachea

Nasal Passage

Bronchi Tubes

Alveoli (air-sacs)

Thin-walled blood vessels called capillaries

Very thin cells line the alveoli so that O2 and CO2 can pass in and out of the blood.

Bronchioles pass air to and from your alveoli.

The Trachea is held open by partial rings of cartilage.

Tongue

Pharynx

Where are We?

We are here.

Larynx (voice box)

Lies between the pharynx and the trachea

Has a framework of cartilage called the Adams

appleAs air leaves the lungs the

vocal cords vibrate and produce sound

This is a special piece of cartilage that Is a leaf like structure.

It closes the opening into the larynx during swallowing, preventing food

And liquids from entering the respiratory tract

Epiglottis

• Your trachea (windpipe) splits up into two bronchi tubes.

• Each bronchus enters a lung and carriesair from the trachea to the lungs

The Bronchi Tubes and Bronchiole

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The Bronchi Tubes and Bronchiole

These bronchi tubes split up, like tree branches, and get smaller and smaller

inside your lungs. They form your smallest branches called bronchioles.

The air flows past your bronchi tubesand into your bronchioles. These tubes

keep getting smaller and smaller until theyfinally end with small air sacs (called alveoli).

But we will go there later…

Alveoli and Bronchi Picture

Trachea

Bronchi Tubes

Bronchiole

Alveoli

Nasal Passage

Bronchi Tubes

Alveoli (air-sacs)

Thin-walled blood vessels called capillaries

Very thin cells line the alveoli so that O2 and CO2 can pass in and out of the blood.

Bronchioles pass air to and from your alveoli.

The Trachea is held open by partial rings of cartilage.

Tongue

Pharynx

Where are We?

We are here.

Now we will head over to the alveoli and what happens when the

air finally makes it down there.

THE ALVEOLI AND CAPILLARY NETWORK

• Air sacs that look like bunch of grapes• Adults have approximately 500 million alveoli• Capillaries allow oxygen and carbon dioxide to be

exchanged between the blood and the lungs• Inner surface of the alveoli are covered with a

liquid fatty substance that helps prevent the lungs from collapsing

The Alveoli and Capillary Network

Your alveoli are tiny air sacsthat fill up with air/oxygen when you

breath in.

Your alveoli are surrounded bymany tiny blood vessels called

capillaries.

The walls of your alveoli (and capillaries) are so thin that the oxygen or carbon dioxide can

pass through them, traveling right into, orout of your blood stream.

Alveoli

Here is a closeup picture ofyour Alveoli

and a Capillarysurrounding it.

Capillary

Red Blood Cell

Oxygen is picked up

Carbon Dioxide is dropped off

Wall of the air sac

Nasal Passage

Bronchi Tubes

Alveoli (air-sacs)

Thin-walled blood vessels called capillaries

Very thin cells line the alveoli so that O2 and CO2 can pass in and out of the blood.

Bronchioles pass air to and from your alveoli.

The Trachea is held open by partial rings of cartilage.

Tongue

Pharynx

Where are We?

We are here.

Alveolus

Ventilation: Movement of air into and out of lungs. Has three aspects

External respiration: Internal respiration: Cellular Respiration:

Internal and External Respiration• Video

External Respiration• - Exchange of oxygen and carbon dioxide between the lungs and blood stream

• Oxygen breathed in through the respiratory system enters the alveoli

• Concentration of oxygen in the alveoli is higher than the concentration in the blood capillaries

• Oxygen leaves the alveoli and enters the capillaries or bloodstream

External Respiration Continued

• Carbon dioxide is a waste product carried in the blood stream• Concentration of carbon dioxide is higher in the capillaries

• It leaves the capillaries and enters the alveoli• Alveoli expel it from the body during exhalation

Internal Respiration• Exchange of carbon dioxide and oxygen between the cells

and bloodstream• Oxygen is carried to the cells by the blood.

• Concentration of oxygen is higher in the blood than in the body cells

• Oxygen leaves the blood capillaries and enters the body cells

• Cells use the oxygen and nutrients to produce energy, water aend carbon dioxide (cellular respiration)• Level of carbon dioxide is higher in cells and enters

the bloodstream to be transported back to the lungs for external respiration to take place.

Cool pictures

Intro to Diaphragm

Now we will look at the Diaphragm. You might be wondering, what does the Diaphragm do? The Diaphragm is an important factor in breathing.

Diagram of Diaphragm

Here is an experiment that you can try.

Diaphragm Experiment

Use the bottles provided to add the balloons

Place a balloon in the top of the bottle so that it can be expanded

Cut a balloon and tape it to the bottom of the bottle.

Make sue it’s as air tight as possible

Inflate and deflate the balloon by pulling on the bottom (diaphgram)

Fun Facts

* At rest, the body takes in and breathes out about 10 liters of air each minute.

* The right lung is slightly larger than the left. * The highest recorded "sneeze speed" is 165 km per hour. * The surface area of the lungs is roughly the same size as a tennis

court. * The capillaries in the lungs would extend 1,600 kilometers if placed

end to end.* We lose half a liter of water a day through breathing. This is the water

vapor we see when we breathe onto glass. * A person at rest usually breathes between 12 and 15 times a minute. * The breathing rate is faster in children and women than in men.

Key Words• Respiratory System- The group of organs in your body that are responsible

for taking in Oxygen and breathing out the Carbon Dioxide which is the waste product of cellular respiration.

• Oxygen-The gas that your body needs to work and function.• Carbon Dioxide- The waste product (gas) that is produced through

respiration of people and animals.• Nose/Nasal Cavity- Where Oxygen first enters your body. Tiny hairs help

filter the air and air is moistened and heated by your nose. Your Nose leads into your Nasal Cavity.

• Mouth/Oral Cavity- Oxygen/air can also enter through your Mouth but it is not filtered. Your Mouth opens up into your Oral Cavity.

• Sinus- A cavity in the bones of your skull that helps moisten and heat the air that you breath.

• Pharynx/Throat- Gathers air from your Nasal and Oral Cavities and passes it to your Trachea.

• Trachea/Windpipe- A tube like pathway that connects your throat to your Bronchi Tubes and lungs. Air passes through it when it travels from the Pharynx to the Bronchi Tubes.

Key Words Cont.

• Bronchi Tubes- Each tube (one per lung) splits up into many smaller tubes called Bronchiole, like branches on a tree.

• Bronchiole- Keep splitting up until they reach your Alveoli.• Respiratory Bronchiole- The air-tubes that are actually connected to the

Alveoli.• Alveolar Duct- The final tube, which is part of the Alveoli, that leads to the

air-sacs.• Alveolar Sac- Where the chemical change takes place and where blood

cells pick up oxygen and drop off carbon dioxide.• Alveoli- Tiny air-sacs at the end of your Alveolar Duct. They fill up with

Oxygen and are surrounded by Capillaries.• Capillaries- Tiny blood streams (around one cell wide) that surround your

Alveoli. They take Oxygen out of our Lungs and replace it with Carbon Dioxide, which you later breath out.

• Diaphragm- The muscle membrane that helps you breath in and out by changing the pressure in your chest cavity.