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Thin!. Cells & Systems. The Respiratory System. How’s the air up there?. The System. So what is the respiratory system for? It is the system responsible for supplying your blood with oxygen (inhale) and removing the carbon dioxide (exhale). Breathing.

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Cells & Systems

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Cells systems

Thin!

Cells & Systems

The Respiratory System

How’s the air up there?


The system

The System

  • So what is the respiratory system for?

  • It is the system responsible for supplying your blood with oxygen (inhale) andremoving the carbon dioxide (exhale)


Breathing

Breathing

  • The process of moving air into, and out of, your lungs

  • To do this you require two special muscles:

    • The Diaphragm

    • Rib Muscles


The inhale

The Inhale

  • Inhale  Air Into Lungs

  • Diaphragm & rib Muscles contract and 2 things happen …

    • Ribs go up

    • Diaphragm goes down

  • This increases the size of your chest and lungs

  • Pulls air into your lungs

  • Breathing Mechanics


The exhale

The Exhale

  • Exhale  Air out of lungs

  • Diaphragm & ribs relax and 2 things happen …

    • Ribs go down

    • Diaphragm goes up

  • This decreases the size of chest and lungs

  • Forces air out of lungs

  • Blue Bromo-something Test Video


The structures

The Structures

  • Air enters your respiratory system via …

  • The Nose

  • The Mouth

  • The Trachea

  • The Bronchi

  • The Lungs


Gas exchange process

Gas Exchange Process

  • Your cells need oxygen to release energy from nutrients (i.e.: glucose … “sugar”)

  • They also need to get rid of CO2 (Carbon Dioxide)

    • Why?

      • Because CO2 is toxic to the body

  • Why is CO2 toxic?


Gas exchange process cont

Gas Exchange Process Cont …

  • Oxygen-rich air comes into the lungs through a series of “tube-like” pathways

    • These are known as bronchi

  • The bronchi are lined with a very tough connective tissue

    • Why?

      • It prevents the walls of the bronchi from collapsing due to the pressures

  • The bronchi narrow as they go into bronchioles

  • Gas Exchange


Gas exchange process cont1

Gas Exchange Process Cont …

  • At the end of the bronchioles are about 600 000 000 (that’s right 600 million) air filled sacs called alveoli

  • These alveoli (air sacs) are surrounded by capillaries (blood)

  • Both the alveoli & the capillaries are made of specialized epithelial cells

    • Only 1 cell layer thick!

  • Why is that important?


Gas exchange process cont2

Gas Exchange Process Cont …

  • Diffusion!

    • Creates a short distance between air & blood

  • Air inside the alveoli has…

    • A high concentration of Oxygen (O)

    • A low concentration of Carbon Dioxide (CO2)

  • Naturally oxygen diffuses from the alveoli to the capillaries & carbon dioxide back the other direction


Gas exchange process cont3

Gas Exchange Process Cont …

  • It only takes one second for your blood to travel through your lungs and pick up all the oxygen it is capable of holding

  • So … if that is the case:

    • Why is it more difficult to breath in higher altitudes … for example like mountain climbing?


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