RESPIRATORY SYSTEM

1.External respiration

2.Internal respiration

FUNCTION of the SYSTEM

Moves oxygen from the outside

environment

Takes out carbon dioxide and water

from the body

RESPIRATIONExternal Internal

Between environment and lungs

Between blood and cell

http://activity.ntsec.gov.tw/lifeworld/english/content/body_cc4.html

RESPIRATORY

TRACTBronchi

Epiglottis

TRACHEA

TUBULAR PASSAGEWAY FOR AIR

Bronchioles

http://www.youtube.com/watch?v=HiT621PrrO0Respiration Video

The Mechanics of Breathing

DIAPHRAGMDome-shaped muscle attached to rib cage that contracts& flattens out during breathing

Observe what happens to the diaphragm.

PRESSUREforce of air pressing down

Less air particles- Low air pressure

More air particles- High air pressure

High to Low Pressure

(Many to Less)

How do you change the pressure?

Air pressure (outside air)

Air pressure (empty space)

Air pressure (inside balloon

Breathing – The Lungs

• Breathing animation

"nature hates a vacuum"

http://www.biosci.ohiou.edu/introbioslab/Bios170/diffusion/Diffusion.html

Breathing in - inhaling• Rib cage– expands

• Diaphragm– moves downward

• Pressure– reduces inside lung

• Result – air is drawn into the lungs

Breathing out - exhaling• Rib cage– contracts

• Diaphragm– moves upward / inward

• Pressure– increases inside lung

• Result – air is pushed out of the lung

BREATHING

Breathing – The Lungs• Breathing animation

Write a paragraph explanation/ summary on how breathing works. Discuss the role of the ribcage and the diaphragm and how these creates a pressure difference so breathing can take place.

"nature hates a vacuum" http://www.biosci.ohiou.edu/introbioslab/Bios170/diffusion/Diffusion.html

Gas Exchange

Air Composition

Inhaled air

Nitrogen N2 – 79% Oxygen O2 – 20% CO2 – 0.04% Others - 0.96%

Exhaled air

Nitrogen N2 – 79% Oxygen O2 – 16% CO2 – 4% Others - 1%

Breathing – The Alveoli

• Diffusion– The movement of gas from an area of high

concentration to an area of low concentration.

http://patrickpoon.com/etp/Diffusion.html

http://www.biosci.ohiou.edu/introbioslab/Bios170/diffusion/Diffusion.html

DIFFUSION

http://patrickpoon.com/etp/Diffusion.html

AlveoliCO2 and O2 exchanged at the same time

venule (deoxygenated blood)

arteriole (oxygenated blood)

Breathing – The Alveoli

O2O2 O2

O2

O2 CO

2

CO2

CO2 CO2

CO2

Breathing in Breathing outhigh concentrationof oxygen

high concentrationof carbon dioxide

low concentrationof oxygen

low concentrationof carbon dioxide

Diffusion

To the heart

From the heart

RespirationFood + Oxygen CO2 + water + ENERGY

Glucose + O2 CO2 + water + ENERGY

C6H12O6 + O2 CO2 + H2O + ENERGY

C6H12O6 + 6O2 6CO2 + 6H2O + ENERGY

Cell Respiration

C6H12O6 + 6O2 6CO2 + 6H2O + Energy