Presentation is loading. Please wait.

Presentation is loading. Please wait.

1 Compare and Contrast How do vertebrates differ from other chordates 2 Review Describe the seven essential functions performed by all animals Explain.

Similar presentations


Presentation on theme: "1 Compare and Contrast How do vertebrates differ from other chordates 2 Review Describe the seven essential functions performed by all animals Explain."— Presentation transcript:

1 1 Compare and Contrast How do vertebrates differ from other chordates 2 Review Describe the seven essential functions performed by all animals Explain Why must waste products produced by metabolic processes be eliminated from an animal’s body 3 Classify A classmate is looking at a unicellular organism under a microscope and asks you if it is an animal- what do you answer and why

2 CH 25 INTRODUCTION TO ANIMALS 25.1 What is an Animal

3 Characteristics of Animals  Heterotrophs  Obtain energy by eating other organisms  Multicellular  Bodies are composed of many cells  Eukaryotic  Contain a nucleus and membrane-bound organelles  Lack cell walls.

4 Types of Animals  Invertebrates  Chordates.

5 Invertebrates  Include all animals that lack a backbone, or vertebral column  More than 95 percent of animal species are informally called invertebrates  From dust mites to giant squid.

6 Chordates  Exhibit at some stage of life:  Dorsal, hollow nerve cord  Notochord  Tail that extends beyond the anus  Pharyngeal pouches.

7 Chordates  Hollow nerve cord runs along the dorsal (back) part of the body  Nerves branch from this cord at intervals.

8 Chordates  Notochord is a long supporting rod that runs through the body just below the nerve cord  Most chordates only have a notochord as embryos.

9 Chordates  All chordates have a tail that extends beyond the anus at some point in their lives.

10 Chordates  Pharyngeal pouches are paired structures in the throat region (pharynx)  Slits may develop to connect to outside of body for gas exchange (gills).

11  Most chordates develop a backbone, or vertebral column, constructed of bones called vertebrae  Vertebrates  Chordates with backbones  Fishes, amphibians, reptiles, birds, and mammals.

12 Animal Survival

13 Maintaining Homeostasis  Feedback inhibition or negative feedback  System in which the product or result of a process limits the process itself  If you get too cold, you shiver, using muscle activity to generate heat  Thermostat in house.

14 Gathering and Responding to Information  Nervous system gathers information using receptor cells that respond to sound, light, chemicals, and other stimuli  Other nerve cells collect and process that information and determine how to respond.

15  Often respond to processed information by moving  Muscle tissue contracts when stimulated by the nervous system  Muscles work together with some kind of a skeleton.

16  Some invertebrates have only a loose network of nerve cells, with no real center  Other invertebrates and most chordates have large numbers of nerve cells concentrated into a brain.

17 Obtaining and Distributing Oxygen and Nutrients  All animals must breathe to obtain oxygen  May use gills, lungs, or air passages.

18  All animals must eat to obtain nutrients  Most animals have a digestive system that acquires food and breaks it down into forms cells can use.

19  Animals must transport them to cells throughout their bodies by using some kind of circulatory system.

20 Collecting and Eliminating CO 2 and Other Wastes  Animals’ metabolic processes generate carbon dioxide and other waste products, some of which contain nitrogen in the form of ammonia  Many animals eliminate carbon dioxide by using their respiratory systems.

21  Most complex animals have a specialized organ system for concentrating, processing, and eliminating other wastes, such as ammonia.

22  Circulatory system must collect wastes from cells throughout the body and then deliver them to the respiratory or excretory system.

23 Reproducing  Most animals reproduce sexually by producing haploid gametes  Many invertebrates and a few vertebrates can also reproduce asexually.


Download ppt "1 Compare and Contrast How do vertebrates differ from other chordates 2 Review Describe the seven essential functions performed by all animals Explain."

Similar presentations


Ads by Google