Respiratory Respiratory SystemSystem

IN comes the OXYGEN, OUT IN comes the OXYGEN, OUT goes the CARBON DIOXIDE!goes the CARBON DIOXIDE!

Respiratory System: Respiratory System: FunctionFunction To bring about To bring about

exchange of oxygen exchange of oxygen and carbon dioxide and carbon dioxide in the bloodin the blood

Oxygen fuels Oxygen fuels cellular respirationcellular respiration

Carbon dioxide is a Carbon dioxide is a waste product from waste product from cellular respirationcellular respiration

Respiratory System: The Respiratory System: The PartsParts Nose and MouthNose and Mouth

Bring in oxygen, expel carbon dioxideBring in oxygen, expel carbon dioxide Why do you have nose hairs???Why do you have nose hairs???

To clean incoming air of dirt and other harmful To clean incoming air of dirt and other harmful substancessubstances

PharynxPharynx:: Passageway for airPassageway for air

Larynx:Larynx: Located at end of pharynxLocated at end of pharynx Contains the VOICE BOXContains the VOICE BOX

Trachea:Trachea: Air is cleaned by mucus and CILIA (tiny hairs)Air is cleaned by mucus and CILIA (tiny hairs)

Respiratory System: The Respiratory System: The Parts con’t..Parts con’t.. Bronchus (Bronchus (pl. Bronchi)pl. Bronchi)

Very large tubes that branch from Very large tubes that branch from trachea trachea

Each leads to one LUNGEach leads to one LUNG BronchiolesBronchioles::

Each bronchus branches into these Each bronchus branches into these smaller tubessmaller tubes

Spread throughout each lungSpread throughout each lung

Respiratory System: The Respiratory System: The Parts con’t..Parts con’t..

AlveoliAlveoli:: Tiny air sacs located at Tiny air sacs located at

the end of bronchioles the end of bronchioles in the lungsin the lungs

Site of Site of gas exchangegas exchange in in the lungsthe lungs Surrounded by Surrounded by

capillaries!capillaries! Oxygen diffuses into Oxygen diffuses into

blood stream, Carbon blood stream, Carbon dioxide diffuses outdioxide diffuses out

Look like bunches of Look like bunches of grapesgrapes!!

Gas exchange in alveoliGas exchange in alveoli

Respiratory System: Respiratory System: BreathingBreathing Driven by air pressure created by chest cavityDriven by air pressure created by chest cavity

Air moves from High to Low pressureAir moves from High to Low pressure Diaphragm:Diaphragm:

Large, flat muscle located at the bottom of the lungsLarge, flat muscle located at the bottom of the lungs Inhalation:Inhalation:

Diaphragm FLATTENS AND CONTRACTS allowing air into Diaphragm FLATTENS AND CONTRACTS allowing air into the lungsthe lungs

Chest cavity EXPANDSChest cavity EXPANDS Exhalation:Exhalation:

Diaphragm RISES AND RELAXES forcing air out of lungsDiaphragm RISES AND RELAXES forcing air out of lungs Chest cavity COLLAPSESChest cavity COLLAPSES

Let’s see this in action!Let’s see this in action!