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2.2 THE RESPIRATORY SYSTEM

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2.2 THE RESPIRATORY SYSTEM Function of Parts Continued . Trachea: smooth muscle reinforced by cartilage rings. It is the main tube that directs air into or out of ... – PowerPoint PPT presentation

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Title: 2.2 THE RESPIRATORY SYSTEM


1
2.2 THE RESPIRATORY SYSTEM
2
Function
  • The exchange of oxygen and carbon dioxide between
    the Red blood cells and the lungs
  • The circulatory system transports the oxygen and
    carbon dioxide to and from the rest of the body
    cells

3
Anatomy of the Respiratory System
Nasal passage
Epiglottis
12
Mouth
Pharynx
Larynx
Trachea
Lung
Right Bronchus
Left Bronchus
Bronchiole
Alveoli
Diaphragm
4
Function of the Parts
  • Nasal Passage/Mouth warms the air as it enters
    the body
  • Epiglottis flap of tissue that divides the
    respiratory system digestive system
  • Pharynx collects the warmed air
  • Larynx contains the vocal chords that vibrate to
    make sound as air is pushed out from the lungs
  • Diaphragm a muscle that helps to change the
    pressure inside the lungs during inhalation and
    exhalation

5
Function of Parts Continued.
  • Trachea smooth muscle reinforced by cartilage
    rings. It is the main tube that directs air into
    or out of the lungs. This tube branches into
    smaller tubes within the lungs.
  • a) Bronchus (bronchi) one of two large
    branches
  • into lungs
  • b) Bronchioles any of the tiny branches into
    which a
  • bronchi divides
  • Alveoli sacs that fill with oxygen when we
    breath in and carbon dioxide when we breath out.
    They are the site of gas exchange between the
    lungs and the circulatory system.

6
Lining of the Tract
  • The interior lining of the respiratory system is
    covered in cilia (hair-like structures)
  • Cilia trap debris you breathe in
  • Mucous secreted by cells collect the debris
    together (what do you think snot is?) so that
    body can get rid of it via sneezing (from your
    nose), coughing (from your lungs)

7
Alveoli
From the Pulmonary Artery of the heart
Capillary
To the Pulmonary Vein of the heart
  • Are like a balloon and are composed of a membrane
    that is kept moist within the lung
  • Oxygen dissolves into the thin layer of liquid
    that sits on the inside of the sac
  • The sac is covered by tiny capillaries so the
    oxygen can move into the bloodstream

8
INHALATION
EXHALATION
  • Breathing in
  • Breathing out
  • Carbon dioxide exits the lungs
  • Chest volume is small
  • Ribs move down and in
  • Diaphragm relaxes and pushes up
  • Oxygen enters the lungs
  • Chest volume is large
  • Ribs move up and out
  • Diaphragm contracts and pushes down

9
Inhalation Exhalation
Air RUSHES in pressure is lower inside the lungs
that outside
Air RUSHES out pressure is higher inside the
lungs that outside
10
Review Questions
  1. Why are cilia important in the respiratory
    system?
  2. People that smoke often have trouble breathing.
    What part of the respiratory system do you think
    is affected by smoking and how does it affect
    your ability to breathe?
  3. Describe how oxygen and carbon dioxide are
    exchanged.
  4. What is the difference between inhalation and
    exhalation and how does each work?
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