Stimulus and Response Why animals and plants do what they do OR A fancy way of saying cause and effect in the animal world Describe a situation in which you were immediately scared andor reacted quickly to something Write at least 1 complete sentence describing your ID: 768779
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Stimulus and Response Why animals and plants do what they do ORA fancy way of saying cause and effect in the animal world.
Describe a situation in which you were immediately scared and/or reacted quickly to something. Write at least 1 complete sentence describing your experience in your spiral. http://www.youtube.com/watch?v=h6-evXswaQs
What is a stimulus? any change in an organism’s environment that causes to the organism to react. It is a fancy way of saying “cause”. Example: An animal is cold so it moves into the sun. Example: Getting a drink when you are thirsty.
What is a response? how the organism reacts to a stimulus and results in a change in behavior. It is a fancy way of saying “effect”. Example: An animal is cold so it moves into the sun. Example: Getting a drink when you are thirsty.
Examples of stimuli and their responses: Circle the stimulus and underline the response:You are hungry so you eat some food On your own, complete the rest of question 4
Plants also respond to their environment. They are called tropisms phototropism thigmotropism gravitropism
There are two types of stimuli: External StimuliandInternal Stimuli
External Stimulus a stimulus that comes from outside an organism. Examples: 1. You feel cold so you put on a jacket. 2. A snake lunges at a rabbit so it runs away. 3. It is a very hot, sunny day so a dog sits in the shade.
Internal Stimulus a stimulus that comes from inside an organism. Examples: 1. You feel hungry so you eat some food. 2. A cat feels thirsty so it drinks water. 3. A dog feels sick so it’s body triggers a fever.
Animals can respond to stimuli in two ways: 1. In a way that they learned. We call this learned behavior. OR 2. In a way that they were just born knowing how to do. We call this instinct.
Learned behavior: a response to a stimulus that an animal was taught. Examples: chimps bear teaching her and monkeys cubs to fish learning to use tools
Learned behavior: Pavlov’s Dog Famous dog experiment done by Ivan Pavlov ring a bell feed dog dog salivates over time, the dog will salivate when it hears the bell.
Instinct: an animal’s natural reaction to a stimulus. It is an automatic reaction that the animal was not taught to do. Examples: getting away from danger Examples: finding or building a shelter
Homeostasis An organisms response to internal and external stimuli helps to maintain homeostasisHomeostasis – balance or equilibrium inside a living organismBlood sugar levelsSweating/shiveringFever VomitingPlant tropisms
Blood Glucose Levels In order to maintain homeostasis, your body tries to keep a certain blood glucose levelWhen blood glucose is low, you should eatWhen blood glucose is high, your pancreas should release insulinProblems with this system can create diabetes
Pill Bugs After watching the pill bug demonstration, complete the activity. http://youtu.be/p97-JHO-RNM