Chapter 3 Lesson 2Chapter 3 Lesson 2

What is the Respiratory What is the Respiratory System?System?

What is the job of the respiratory What is the job of the respiratory system?system?

The respiratory system carries The respiratory system carries gasesgases between the outside air and your between the outside air and your bloodblood. .

Your respiratory system is at work Your respiratory system is at work whenever you smell, sing, talk, laugh, or whenever you smell, sing, talk, laugh, or breathe. breathe.

The parts of the respiratory system The parts of the respiratory system include:include:

TracheaTrachea

BronchiolesBronchioles

Air sacsAir sacs

DiaphragmDiaphragm

LarynxLarynx

A closer look at the partsA closer look at the parts

The The tracheatrachea is a tube is a tube that carries air from that carries air from the the larynxlarynx to the to the lungs.lungs.The The larynxlarynx contains contains your vocal cords. your vocal cords. The The bronchiolesbronchioles are are smaller tubes from smaller tubes from bronchi that branch bronchi that branch out from the trachea.out from the trachea.

The The diaphragmdiaphragm is a is a muscle in the bottom muscle in the bottom of the chest area that of the chest area that contracts with contracts with breathing. breathing. Air sacsAir sacs are where are where oxygen enters the oxygen enters the blood and carbon blood and carbon dioxide leaves the dioxide leaves the blood. They are also blood. They are also called alveoli. called alveoli.

More About the Air SacsMore About the Air Sacs

Air sacs walls are covered with a web of Air sacs walls are covered with a web of tiny blood vessels called tiny blood vessels called capillariescapillaries. .

Larynx, Trachea, and BronchiLarynx, Trachea, and Bronchi

Bronchioles, Air Sacs, and Bronchioles, Air Sacs, and DiaphragmDiaphragm

How we breatheHow we breatheSeveral muscles work together when you Several muscles work together when you breathe. When you inhale, your diaphragm breathe. When you inhale, your diaphragm contracts and moves down, making more contracts and moves down, making more space in your chest. Your rib muscles may space in your chest. Your rib muscles may also pull your rib cage up and out, making also pull your rib cage up and out, making still more space. Air quickly rushes into the still more space. Air quickly rushes into the lungs and takes up the new spaces. When lungs and takes up the new spaces. When your diaphragm and rib muscles relax, your diaphragm and rib muscles relax, they push air out of the lungs. they push air out of the lungs. Look at the picture on the next slide to see Look at the picture on the next slide to see how we breathe.how we breathe.

How do the respiratory system and the How do the respiratory system and the circulatory system work together?circulatory system work together?

In humans, the respiratory and circulatory In humans, the respiratory and circulatory systems work together to get systems work together to get oxygenoxygen to the to the cellscells..

The respiratory system gets air all the way to The respiratory system gets air all the way to your air sacs where the blood (circulatory your air sacs where the blood (circulatory system) picks it up there and carries it all to your system) picks it up there and carries it all to your cells. cells.

In the air sac, oxygen leaves the lungs and In the air sac, oxygen leaves the lungs and enters the blood and carbon dioxide leaves the enters the blood and carbon dioxide leaves the blood and enters the lungs.blood and enters the lungs.

Respiratory and Circulatory Systems Respiratory and Circulatory Systems working together continued….working together continued….

Holding your breath causes Holding your breath causes carbon dioxidecarbon dioxide to build up in your blood. Your brain can to build up in your blood. Your brain can sense this, so it sends a message to the sense this, so it sends a message to the diaphragm and diaphragm and rib musclesrib muscles telling them to telling them to breathe. breathe.

Diseases of the Respiratory Diseases of the Respiratory SystemSystem

ColdCold- runny nose, - runny nose, stuffy nose, sneezingstuffy nose, sneezing

InfluenzaInfluenza- cough, - cough, sore throat, stuffy sore throat, stuffy nose, fevernose, fever

PneumoniaPneumonia- cough, - cough, chest pain, shortness chest pain, shortness of breath, feverof breath, fever

TuberculosisTuberculosis- cough, - cough, fever, wheezingfever, wheezing

Lung cancer-Lung cancer- lung lung cells grow incorrectly cells grow incorrectly and very quicklyand very quickly

What have we learned today?What have we learned today?The respiratory system carries what The respiratory system carries what between the outside air and your blood?between the outside air and your blood?Name the parts of the respiratory system.Name the parts of the respiratory system.What cover the walls of air sacs? What cover the walls of air sacs? How do the respiratory system and How do the respiratory system and circulatory system work together?circulatory system work together?Hold your breath for ten seconds. What Hold your breath for ten seconds. What just built up in your blood? just built up in your blood? Name 2 diseases of the respiratory Name 2 diseases of the respiratory system.system.