The respiratory system
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THE RESPIRATORY SYSTEM . C16L1 Part 1. The Respiratory System. What does the respiratory system do? How do the parts of the respiratory system work together? How does the respiratory system interact with other body systems?. Functions of the respiratory system . breathing

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THE RESPIRATORY SYSTEM

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The respiratory system

THERESPIRATORY SYSTEM

C16L1

Part 1


The respiratory system

The Respiratory System

  • What does the respiratory system do?

  • How do the parts of the respiratory system work together?

  • How does the respiratory system interact with other body systems?


Functions of the respiratory system

Functions of the respiratory system

  • breathing

  • gas exchange between the atmosphere and the blood (supply oxygen & removes carbon dioxide and other waste gases)

  • preventing foreign substances from entering during breathing

  • phonation (speaking)


Breathing

Breathing

  • Breathingis the movement of air into and out of the lungs.

  • Breathing enables your respiratory system to take in oxygen and to eliminate carbon dioxide.


Respiratory system

Respiratory System

  • Every cell in your body needs oxygen for a series of chemical reactions called cellular respiration.

  • During cellular respiration, oxygen and sugars react, releasing energy a cell can use.

  • Your respiratory system removes carbon dioxide and other waste gases from your body, so that cells can function.


Inhale inspiration

Inhale / Inspiration

breathe in


Exhale expiration

Exhale / Expiration

breathe out


Structures of the respiratory system

STRUCTURES OF THE RESPIRATORY SYSTEM

  • nose and nasal cavities

  • pharynx

  • larynx

  • trachea

  • bronchi

  • bronchioles

  • alveoli


Nose and nasal cavities

nose and nasal cavities

nasal septum: separate the two nasal cavities


Ciliated mucous membranes

ciliated mucous membranes

Cilia line the nose and most other airways in the respiratory system.


Functions of the cilia

Functions of the cilia

  • Wavelike motions of the cilia carry trapped particles away from your lungs.

  • The cilia help prevent harmful particles from getting very far into your respiratory system.


Functions of the ciliated mucous membranes

Functions of the ciliated mucous membranes

  • filters bacteria, smoke, and dust particles from the air

  • warms and moistens air

If anything irritates nasal membranes, it stimulates sneezing.


Mucous

mucous

a thick, sticky substance that filters the air entering the body


Pharynx

pharynx

The pharynxis a tube-like passageway at the top of the throat that receives air, food, and liquids from the mouth or nose.


Pharynx1

pharynx

  • muscular tube lined with a ciliated mucous membrane

  • about 5 inches long

  • extends from the back of the nose to the esophagus

  • sometimes called the "control center" for incoming substances, since it serves both the respiratory and digestive systems


7 openings into or out of the pharynx

7 openings into or out of the pharynx

  • 2 openings of nasal cavities

  • 2 passageways to middle ear-space (Eustachian tubes)

  • opening of mouth

  • esophagus (passageway to stomach)

  • larynx (passageway to lungs)


Larynx

larynx

(voice box) short passageway from the pharynx to the trachea


Larynx1

larynx

walls consist of cartilage pieces held together by several muscles and ligaments


Vocal chords or folds

vocal chords (or folds)

a pair of membrane folds in the larynx


False vocal cords

false vocal cords

The more superior set, called the false vocal cords, functions primarily to protect the glottis.


True vocal cords

true vocal cords

The inferior set, the true vocal cords, produces the voice.


Vocal chords or folds1

vocal chords (or folds)

vocal chords in females are thinner and shorter (they vibrate more rapidly)


Vocal chords or folds2

vocal chords (or folds)

vocal chords in males are thicker and longer (they vibrate more slowly)


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