Respiratory System Outcome I can describe the respiratory

Respiratory System: § Outcome: I can describe the respiratory organs (structure) and their main function in the respiratory system. § Drill: What is the function of the epiglottis

The Trachea and Bronchial Branches Bronchioles (continued) • Two types 1. Terminal bronchioles (from tertiary bronchi) • Lead to pulmonary lobules (gas exchange) 2. © 2015 Pearson Education, Inc. Respiratory bronchioles (after terminal bronchioles)

Overview of bronchi and bronchioles Cartilage LEFT LUNG Left primary bronchus Secondary bronchus Cartilage plates Visceral pleura Tertiary bronchi Secondary (superior lobar) bronchus Bronchiole Respiratory epithelium Smooth muscle Bronchioles Terminal bronchiole Pulmonary lobule © 2015 Pearson Education, Inc. Respiratory bronchiole Figure 21. 5 4

The Trachea and Bronchial Branches Airflow and diameter changes • Trachea → primary bronchi → secondary bronchi → tertiary bronchi → bronchioles → terminal bronchioles → respiratory bronchioles → alveoli • Bronchi branch into smaller and smaller tubes • At each new branch, the diameter decreases © 2015 Pearson Education, Inc.

Overview of bronchi and bronchioles Cartilage LEFT LUNG Left primary bronchus Secondary bronchus Cartilage plates Visceral pleura Tertiary bronchi Secondary (superior lobar) bronchus Bronchiole Respiratory epithelium Smooth muscle Bronchioles Terminal bronchiole Pulmonary lobule © 2015 Pearson Education, Inc. Respiratory bronchiole Figure 21. 5 4

Gross Anatomy of the Lungs Gross anatomy of the lungs (continued) • Each lung is divided into lobes • The right lung has three lobes • Superior, middle, inferior • Divided by a horizontal and oblique fissure • The left lung has two lobes • Superior and inferior • Divided by oblique fissure • Also has an indentation in the medial margin called the cardiac notch • Each lung is surrounded by a pleural cavity © 2015 Pearson Education, Inc.

Gross Anatomy of the Lungs Gross anatomy of the lungs (continued) • Base •

Features of the lateral surfaces of the lungs Lateral Surfaces Apex Posterior Superior lobe Anterior Posterior Superior lobe Horizontal fissure Oblique fissure Middle lobe Inferior lobe Base © 2015 Pearson Education, Inc. Cardiac notch Oblique fissure Inferior lobe Base Figure 21. 6 3

Continuous passageways of the respiratory tract Trachea Primary bronchus Secondary bronchus Tertiary bronchi Terminal bronchioles Pulmonary lobule © 2015 Pearson Education, Inc. Bronchioles Respiratory bronchiole Bronchopulmonary segment Alveoli Figure 21. 7 1

Pulmonary Lobules Alveoli • Supplied by an alveolar duct • Attached to a common chamber (alveolar sac) • Approximately 150 million/lung • Give the lungs an open, spongy appearance • Surrounded by extensive capillary network • Allows for gas exchange • Also surrounded by elastic fibers • Allow expansion and recoil with air movement in and out © 2015 Pearson Education, Inc.

Respiratory System: § Exit Ticket: § Describe the major differences between the left and right lung?