1 / 25

Respiratory System

Respiratory Structures. Lungs

colby
Download Presentation

Respiratory System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. Respiratory System Responsible for bringing oxygen to blood in lungs or gills and expelling CO2 from blood. Contains large surface area by folding and refolding upon itself; also exhibits: Steep diffusion gradient for O2, CO2 Short diffusion distance (thin walls) High degree of vascularization Coordinated air and blood movement Diffusion of gases occurs across 2 layers of thin simple squamous epithelium w/ basal lamina Gases must be dissolved in fluid in respiratory tract to diffuse (causes water loss problems in Tetrapods)

    2. Respiratory Structures Lungs Terrestrial Gills - Aquatic, in some fish buccal cavity and anterior stomach serve as accessory respiratory structures (also some fish possess lungs) Skin (Cutaneous) - amphibians (esp. lungless salamanders) Terrestrial Situation = bidirectional flow (expired and inspired air over same surfaces), except in birds (unidirectional crosscurrent system) Aquatic Situation = water flow over gills is unidirectional, countercurrent exchange = blood and water pass in opposite directions

    3. Terrestrial Respiratory System Consists of paired lungs and branching system of airways bringing air to respiratory surface for gas exchange. Sequence (anterior to posterior, for mammal):

More Related