Copyright Pearson Prentice Hall Stimulus Response Activity 1: Elements of Behavior 34-1 Actively read sections 1 and 2 Study the graphics and read ALL captions. Answer any questions you encounter. Photo Credit: ©OSF/LILLIE, Peter/Animals Animals Enterprises Copyright Pearson Prentice Hall
Copyright Pearson Prentice Hall Stimulus and Response 1. Biologists define behavior as the way an organism reacts to changes in its internal condition or external environment. A behavior can be simple or complex. Copyright Pearson Prentice Hall
Copyright Pearson Prentice Hall Stimulus and Response 2. Behaviors are performed when an animal reacts to a stimulus. 3. A stimulus is any kind of signal that carries information and can be detected. For example, hunger is an internal stimulus that may prompt you to eat. The sound of a ringing phone is an external stimulus that may prompt you to answer the phone. Copyright Pearson Prentice Hall
What are some other internal stimuli? Stimulus and Response 4. Internal Stimuli - Animals respond to many types of internal stimuli, such as: hunger fatigue thirst pain _____________ We more commonly call internal stimuli feelings. What are some other internal stimuli? Copyright Pearson Prentice Hall
Copyright Pearson Prentice Hall Stimulus and Response 5. External Stimuli - Animals respond to many types of external stimuli, such as: light sound odors temperature taste Copyright Pearson Prentice Hall
Fill in the sense associated with each type of external stimuli. Stimulus and Response 5. External Stimuli - Animals respond to many types of external stimuli, such as: light sound odors temperature taste Animals use their senses to detect external stimuli In the environment. Fill in the sense associated with each type of external stimuli. Copyright Pearson Prentice Hall
Copyright Pearson Prentice Hall Stimulus and Response 6. A single, specific reaction to a stimulus is called a response. A behavior may consist of more than one response. For example, a shark may respond to the movement of prey by swimming toward the prey and attacking it. Copyright Pearson Prentice Hall
Copyright Pearson Prentice Hall Stimulus and Response How Animals Respond When an animal responds to a stimulus, its body systems—including the sense organs, nervous system, and muscles—interact to produce the resultant behavior. Activity 3: Video clip http://www.youtube.com/watch?v=fRYvDbY-2E8 Record key points in space provided. Copyright Pearson Prentice Hall
Copyright Pearson Prentice Hall Stimulus and Response Activity 3: Video clip http://www.youtube.com/watch?v=fRYvDbY-2E8 (8:21) 1. s_________________ 2. receptor = __________________________________ 3. co-ordinating p_______________________________ 4. effector = __________________________________ 5. response Copyright Pearson Prentice Hall
Activity 3: Mealworm Observations Were there any common reactions? _________ Analysis ___________________________________ Copyright Pearson Prentice Hall
Copyright Pearson Prentice Hall Activity 3: Mealworm Observations Copyright Pearson Prentice Hall
Copyright Pearson Prentice Hall Stimulus Response Were there any patterns? How did the reaction to the brush differ from the reaction to the food? Why do you think it was different? What kinds of additional experiments could we do to better understand mealworm responses to stimuli? Copyright Pearson Prentice Hall