Functions of the respiratory system
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Functions of the Respiratory System. Brings oxygen in from the environment for our body cells, and removes carbon dioxide waste. Main components: Nose Pharynx : part of the throat behind nasal cavity and mouth. Larynx : voice box, houses vocal cords.

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Functions of the Respiratory System

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Functions of the Respiratory System

  • Brings oxygen in from the environment for our body cells, and removes carbon dioxide waste.

  • Main components:

    • Nose

    • Pharynx: part of the throat behind nasal cavity and mouth.

    • Larynx: voice box, houses vocal cords.

    • Trachea: windpipe, air travels from trachea toward the lungs.


Respiratory System

  • Components continued:

    • Bronchi: or bronchus (singular). The bronchi bring air into the lungs.

    • Bronchioles: bronchi branch into smaller airways that carry air to the alveoli.

    • Alveolus: or Alveoli (plural). Structures in the lungs where gas exchange occurs.

      • Oxygen leaves the alveoli and goes into the bloodstream to be taken to our cells.

      • Carbon dioxide leaves the blood and into the alveoli to be breathed out.


Nose

Pharynx

Larynx

Trachea

Bronchus

Bronchioles

LEFTLUNG

RIGHTLUNG

Alveolus


The Lungs

  • The lungs: expand and contract to bring air in and force air out of the body.

  • When we bring air into the body it is called inhalation.

  • When we force air out (breathe out) it is called exhalation.

  • The process of breathing in and out is controlled by a muscle called the diaphragm.


LEFTLUNG

RIGHTLUNG

Diaphragm


Breathing

  • The process of breathing is known as respiration.

  • When the diaphragm contracts and pulls downward the lungs expand and pull air in.

  • When the diaphragm relaxes it pushes upward and the lungs contract and push air out.


Disorders of the Respiratory System

  • Lung damage can occur due because of breathing in chemicals (like pollutants, cigarette smoke, asbestos, and fumes).

  • Emphysema: lung tissue damage, that causes problems breathing.

    • Most cases of emphysema develop in smokers, or those exposed to second hand smoke.

    • Tar buildup in the lungs causes lung tissue damage.


Review

  • Air moves through the respiratory system:

    • Nose

    • Pharynx

    • Larynx

    • Trachea

    • Bronchi

    • Lungs

    • Bronchioles

    • Alveoli

  • Breathing in: Inhalation

  • Breathing out: Exhalation

  • Review Video


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