1 / 5

Chapter 17D

Chapter 17D. Class Reptilia Characteristics. 1. Skin Note: What is Keratin? Note: Why the need to keep heat in?. Cool, dry, leathery. Scales composed of keratin. Keratin is a fibrous protein that is waterproof and durable. Skin has to be shed. Keeps the heat in.

brooks
Download Presentation

Chapter 17D

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. Chapter 17D

  2. Class Reptilia Characteristics 1. Skin Note: What is Keratin? Note: Why the need to keep heat in? • Cool, dry, leathery. • Scales composed of keratin. Keratin is a fibrous protein that is waterproof and durable. • Skin has to be shed. • Keeps the heat in. They are mostly Ectothermic! Reptiles have a skin that is composed of keratin. It functions to keep the snake cool and protected. The scales do not grow with the snake and so the skin must be shed as the snake grows!

  3. Class Reptilia Characteristics 2. Respiration Note: Sea Turtles can hold their breath for long periods. 3. Circulation • Have lungs. • Take in air by expanding rib cage. • Three chambered heart. • The single ventricle is partially separated by a septum. • Blood stays mostly separate in the heart as it goes from lungs to heart to body and back. Reptiles have lungs to breathe. The heart of a reptile is three chambered like a frog, but with a septum.

  4. Class Reptilia Characteristics 4. Nervous System Crucial is the Jacobson’s organs: • Brain is less than 1% of total mass of animal. • Brain is less than 0.5% of crocodilians. • Most (sans snakes) have a tympanic membrane. Pits in the mouth that contain nerve endings sensitive to chemicals. To find prey, mates. Reptiles have a very small brain, but have good coordination and eyesight. The have tympanic membranes for hearing and Jacobson’s organs for sensing prey and such.

  5. Classification of Reptiles

More Related