Respiratory System Notes - We Respiratory System Notes February 4, 2013. Respiratory System Functions:

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  • Respiratory System Notes

    February 4, 2013

  • Respiratory System

    Functions:

    1. Brings oxygen (O2) into the body from the environment

    2. Removes waste gases (CO2 and H2O) from the body

    Breathing!!!

  • Respiration = Breathing

    • Breathing: bringing oxygen into the body and removing CO2 and H2O

    • Respiration: The breaking down of glucose molecules inside of cells using oxygen to produce energy (also called cellular respiration)

  • Upper Respiratory Tract

    • Nose

    • Nasal Cavity

    • Mouth

    • Pharynx (Throat)

    • Larynx (Voice Box)

  • Lower Respiratory Tract • Trachea (windpipe) • Bronchi • Lungs • -Bronchioles • -Alveoli

  • Lungs

    • Major organs of the respiratory system

    Inside the lungs:

    • Alveoli: small sacs surrounded by capillaries (small blood vessels)

    • Site of gas exchange

  • Gas Exchange

    • In the alveoli the oxygen (O2) from the inhaled air passes into the blood, and carbon dioxide (CO2) and water (H2O) leave the blood and enter the alveoli

  • Gas Exchange

  • Pleura and Diaphragm

    • Pleura: layer of epithelial tissue that covers the outside of the lungs

    • Diaphragm: the muscle below the lungs that helps you breathe

  • Breathing: How its Done

    • Inhalation (breathing in): diaphragm contracts, increasing the volume in the chest cavity, which lowers the air pressure; the higher air pressure outside the body forces air into the lungs

  • Breathing: How its Done

    • Exhalation (breathing out): diaphragm relaxes, decreasing the volume in the chest cavity, which raises the air pressure; the higher air pressure inside the body forces air out of the lungs

  • Why do we breathe? • We breathe so that we can get oxygen into our

    cells

    Why do our cells need oxygen? Cells use oxygen in a process called cellular

    respiration

    Cellular Respiration:

    Food + Oxygen = Energy (ATP) + CO2 CO2 is produced as a waste product in cellular

    respiration...it is removed from the body through the lungs!

  • Why is it dangerous to hold your breath too long?

    • Holding your breath stops oxygen from getting to the cells in all of your organs (especially your brain cells).

    • This stops the cells from producing enough energy to survive, which kills the cells!