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Chapter 3, Lesson 4

Chapter 3, Lesson 4. How Do Organisms Respond to the Environment?. Stimulus and Response. Stimulus - a change in the environment of an organism that causes a response Response - a reaction of an organism to a change in the environment. Stimulus and Response.

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Chapter 3, Lesson 4

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  1. Chapter 3, Lesson 4 How Do Organisms Respond to the Environment?

  2. Stimulus and Response • Stimulus- a change in the environment of an organism that causes a response • Response- a reaction of an organism to a change in the environment.

  3. Stimulus and Response • Responding to a stimulus (environment) is a life process. • An organism must be able to gather information about its environment before it can respond to changes

  4. Stimulus and Response • External Stimulus: - Stimulus from outside the body Example: Weather Change • Internal Stimulus: - Stimulus from inside the body Example: Hunger and Thirst

  5. Stimulus and Response • Ptarmigan Changes colors during different seasons to blend in with its surroundings. -In the spring they are speckled brown to blend in - In the winter they turn white to blend in with the snow

  6. Ptarmigan

  7. Ptarmigan • Stimulus= Weather Changes • Response= Feathers change colors

  8. Gathering Information • An organism must be able to gather information about its environment before it can respond to changes • Organisms have unique sense organs that let them gather information • Examples:

  9. Sharks • Eyes= see well in the dark • Nostrils= smell blood • Scale-covered openings= feel vibrations

  10. Snakes • Tongues/Organs on roof of mouth= pick up scents • Heat detectors on lips or head= helps to find prey

  11. Flies • Tiny hairs/feet= taste • Sensors on legs= for touch and temperature • Compound eyes= not clear, but easily detect movement

  12. Physiological Adaptation Physiological Adaptation: Make it so an organism’s body parts can do a job in response to a stimulus.

  13. Physiological Adaptation • Humans • Shivering= Physiological adaptation in response to the cold. The muscle contractions create heat. • Sweat= Physiological adaptation in response to the heat. Sweat glands become more active, the sweat evaporates and cools you down.

  14. Physiological Adaptation • Seal -Stopping blood circulation to tail/flippers=Physiological adaptation to the cold water. This helps keep in body heat.

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