Respiratory System

Biology 322Human Anatomy

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Anatomical Structures Support Specific Functions of Respiratory System

Ventilation: Movement of air to and from sites of gas exchange

Gas Exchange: Movement of specific gases such as oxygen & carbon dioxide between air and blood (in lung) or between blood and extracellular fluids (in other tissues)

Gas Transport: Movement of oxygen (in blood) away from lung and of carbon dioxide (also in blood) back toward lung.

Organs of Respiratory System

Organs of Respiratory System

Lungs

Nasal Cavity:

Removes dust & other debrisWarms inhaled airHumidifies inhaled air

Right & left sides of nasal cavity separated by nasal septum;

Nasal cavity separated from oral cavity by palate

Structure of Larynx: Nine cartilages: 3 large unpaired 3 smaller pairs

You identifed these in lab

Vocal cordsVocal cords (also called or ) are strands of dense regular connective tissue running anteriorly from to .If they are adducted (close together) air moving between the cords causes them to vibrate.

Intrinsic muscles of larynx (no, you don’t need to know their names) move

Trachea: Begins at bottom of larynx (cricoid cartilage) Ends

Cricoid Cartilage

Primary Bronchus

Trachea:

Held open

Lumen lined by

Trachea:

Cross section of neck at level of vertebra cervical 6

Lungs: Occupy most of thoracic cavity

Lungs: Primary bronchus, pulmonary artery, and pulmonary veins enter/leave lung together

Lungs: Surrounded

Lungs: Each lung divided into lobes by deep grooves or fissures

Lungs: Each lung divided into lobes by deep grooves or fissures

Lungs: Each lung divided into lobes by deep grooves or fissures

Lungs: Each lung divided into lobes by deep grooves or fissures

Lungs:

Each lobe has

Lungs: Each lobe consists of

Trachea

Primary bronchi

Secondary bronchi

Tertiary bronchi

(smaller branches)

(bronchioles)

Terminal bronchioles

Respiratory bronchioles

Alveolar ducts

Alveoli

Alveoli:

Wall = Other cells:

As the bronchi branch and divide,

At the end,

This air (in the alveolus) and blood (in the capillaries) are separated by a very thin wall, called