Scribd
Upload
115 views4 pages

Respiratory System Structure & Function

The respiratory system allows for gas exchange. Air enters the nose and travels through the pharynx, larynx, trachea, bronchi and bronchioles to tiny air sacs called alveoli in the lungs. Each respiratory structure has a defined role - the nose warms and filters air, the trachea transports air to branching bronchi and the alveoli are the sites of oxygen and carbon dioxide exchange between the bloodstream and air.

Uploaded by

vinnie0905
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
115 views4 pages

Respiratory System Structure & Function

The respiratory system allows for gas exchange. Air enters the nose and travels through the pharynx, larynx, trachea, bronchi and bronchioles to tiny air sacs called alveoli in the lungs. Each respiratory structure has a defined role - the nose warms and filters air, the trachea transports air to branching bronchi and the alveoli are the sites of oxygen and carbon dioxide exchange between the bloodstream and air.

Uploaded by

vinnie0905
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 4

Overview

• Respiratory system function


Respiratory System I: • Respiratory organs: structure and function
Structure and function – Nose
– Pharynx
11/20/09 – Larynx
– Trachea
– Bronchi & aveoli
– Lungs

Respiratory System Respiratory passageway


Function:
1) Oxygen TO the body
1. Nose
2) Carbon dioxide OUT of the body 2. Pharynx
3. Larynx
5. Bronchi
Respiratory system Circulatory system 4. Trachea
& Aveoli

6. Lungs
O2
Air Lungs Blood Tissue
CO2 Diaphragm

Figure 22.1

1
1. Nose 2. Pharynx

Structures: Structure: connects nose and mouth to larynx


• Nasal cavity Function: passage way for air and food
• Respiratory mucosa 3 regions
• Nasopharnyx
Figure 22.3c • Oropharynx
• Laryngopharynx
Function: processing air, produce mucus
larynx
tonsils
Figure 22.3b

3. Larynx 3. Larynx
Structure: connects pharynx to trachea Structure: connects pharynx to trachea
Function: Function:
1. directs air and food 2. voice production
Epiglottis
trachea esophagus False vocal cords
Vocal cords: ligaments vibrate
and produce sound
Epiglottis
True vocal
Epiglottis: cords Glottis: opening to vocal chords
- elastic cartilage Base of
tongue
epiglottis

esophagus trachea - “guards” opening to larynx False vocal cords

glottis laryngitis
True vocal
(b) Sagittal view; anterior cords
surface to the right
Figure 22.4b Figure 22.4b, 22.5

2
5. Bronchi & aveoli
4. Trachea
“windpipe” trachea
Structures:
• Structure: larynx to mediastinum to two bronchi • Bronchi
trachea posterior

esophagus
• Bronchial Tree (bronchioles)
Cilia • Aveoli
Goblet cells & glands  mucus Lumen of
trachea
C shape hyaline cartilage Fig. 22.7
anterior Function:
• Function: passage way for air respiratory zone

Figure 22.6 Fig. 22.8a

6. Lungs
Aveoli: Respiratory Membrane
Parietal
Structure: pleura

Structure: thin air-blood barrier – Occupies thoracic cavity


Visceral
pleura

- aveoli and capillaries fuse membranes – Right broader, 3 lobes R Lung L Lung

- surfactant – Left longer, 2 lobes


Function: exchange of O2 and CO2 – Serous membrane (pleura:
parietal and visceral layer)
capillaries
posterior
Left
Parietal pulmonary
pleura artery

Function: breathing! Visceral


Left
pulmonary
aveoli pleura vein

R Lung
Fig. 22.9 Figure 22.10
anterior

3
Summary
• Air travels through passage ways from the
nose to the lungs where gases can be
exchanged between aveoli and capillaries.

• Each respiratory organ has a specific


location, structure and function.

You might also like