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 HeterotrophsObtain energy by eating other organismsMulticellularBodies are composed of many cellsEukaryoticContain a nucleus and membrane-bound organellesLack cell walls.
13 Maintaining Homeostasis Feedback inhibition or negative feedbackSystem in which the product or result of a process limits the process itselfIf you get too cold, you shiver, using muscle activity to generate heatThermostat in house.
14 Gathering and Responding to Information Nervous system gathers information using receptor cells that respond to sound, light, chemicals, and other stimuliOther 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 systemMuscles 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 oxygenMay 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 CO2 and Other Wastes Animals’ metabolic processes generate carbon dioxide and other waste products, some of which contain nitrogen in the form of ammoniaMany 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 ReproducingMost animals reproduce sexually by producing haploid gametesMany invertebrates and a few vertebrates can also reproduce asexually.