Changes

*Some of the Bronchioles have alveoli scattered along their length, and thus form part of the ''''Respiratory Zone'''' - the site for gaseous exchange.

*Some of the Bronchioles have alveoli scattered along their length, and thus form part of the ''''Respiratory Zone'''' - the site for gaseous exchange.

==Histology==

==[[Bronchi and Bronchioles - Histology|Histology]]==

[[Image:Bronchiole Histology.jpg|right|thumb|300px|©Nottingham 2008]]

 

*The histology of the '''Bronchi''' is almost identical to that of the [[Trachea - Anatomy & Physiology|trachea]] - the lumen of the bronchus is lined by a pseudostratified epithelium, including goblet cells and serous cells.

*The '''Bronchioles''' have no [[Bones and Cartilage - Anatomy & Physiology#Types of Cartilage|cartilage]] rings but have well developed [[Muscles - Anatomy & Physiology|muscular]] walls to enclose the lumen. The epithelium is reduced to cuboidal, and in the normal animal it contains no mucus secreting glands. There are many [[Lymph Nodes - Anatomy & Physiology|lymphoid]] nodules beneath the epithelial layer.

*'''Respiratory Bronchioles''' have few alveoli scattered along the length, at the entrance of which is ''simple squamous'' epithelium, and bronchial [[Muscles - Anatomy & Physiology#Smooth Muscle|smooth muscle]] bundles.

==Species Differences==

==Species Differences==