Stimulus and Response Why animals and plants do what they do OR

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Feedback and Homeostasis

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Presentation transcript:

Stimulus and Response Why animals and plants do what they do OR A fancy way of saying cause and effect in the animal world.

http://www.youtube.com/watch?v=h6-evXswaQs 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.

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 gravitropism phototropism thigmotropism

There are two types of stimuli: External Stimuli and Internal 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: finding or building a shelter Examples: getting away from danger

Homeostasis An organisms response to internal and external stimuli helps to maintain homeostasis Homeostasis – balance or equilibrium inside a living organism Blood sugar levels Sweating/shivering Fever Vomiting Plant tropisms

Blood Glucose Levels In order to maintain homeostasis, your body tries to keep a certain blood glucose level When blood glucose is low, you should eat When blood glucose is high, your pancreas should release insulin Problems with this system can create diabetes

Pill Bugs http://youtu.be/p97-JHO-RNM After watching the pill bug demonstration, complete the activity. http://youtu.be/p97-JHO-RNM