2. Brainstorm a list of stimuli ExternalInternal

3. What is the difference between a stimulus & a response? Stimulus: an action or condition that provokes a response. (Cause) Response: Any behavior of a living organism that results from an external or internal stimulus. (Effect)

4. Internal Stimulus: A signal that comes from within an organism. Examples: ThirstHunger Adrenaline Oxygen Blood sugar levels PathogensToxins

5. External Stimulus: A signal that originates from outside of an organism & causes a response within the organism. Examples: Touch Pressure Heat

6. Learned Response: This is a behavior/response that is learned by observation or training. Examples: Bear cub taught to fish (hunger)

7. Innate Response: Instinct This is a behavior/response that is not taught. It is a natural automatic response.

8. Migrate: to move to another area in order to increase the chance for survival or survival of the species.

9. Fight or Flight: The response to an organism’s acute stress or danger. The response could be “fight” or “flight”. http://www.youtube.com/watch?v=m2GywoS77qc Hormones are released that stimulate the heart, raise blood pressure, constricts small blood vessels, & releases sugar stored in the liver. It relaxes some involuntary muscles & contracts others.

10. Tropism: The turning or bending movement of a living organism or part toward or away from an external stimulus Light = Phototropism Gravity = Geotropism Touch = Thigmotropism Heat = Thermotropism “+” (Positive) = Toward the stimulus “-” (Negative) = Away from stimulus

11. Homeostasis: Refers to the body’s ability to regulate it’s body in response to changing outside elements. The tendency of an organism or cell to maintain a balanced state so as to maintain health and functioning.

12. How does changing an external stimulus affect how an organism will respond? In what ways does an organism’s body respond to maintain homeostasis? How do organisms respond internally when unknown pathogens invade the body?

13. Jump Around Activity Create this table in your Sci. Journal Initial Heart Beat: __________ per min. Jumping Time Beats/min after Jumping Time for heart beat to return 30 sec 60 sec

14. Jump Around Activity Conduct Activity & Collect Data: Discuss with a partner: Internal & External Stimuli involved in the activity Response of the organism in this activity

15. Web Surfing Science Use “Chrome Book” to connect to internet. Use the packet to research the 3 parts & answer the questions. Part I: http://plantsinmotion.bio.indiana.edu/plantmotion/movements/tropism/tropisms.html Part II: http://www.nps.gov/akso/parkwise/students/referencelibrary/general/migrationbasics.htm Part III: http://www.phys.unsw.edu.au/biosnippets/biosnippets_container2.swf

16. How do you think phototropism relates to a plant’s chance for survival? Phototropism is a response by plants that promotes maximum photosynthesis, & therefore plant growth & optimal overall plant health. Without this response, many plants would die & never reproduce.

17. What is the difference between phototropism & photosynthesis? Phototropism is the response of plants to light (usually “+”) that help them to collect sunlight for photosynthesis. Photosynthesis is the process of plants to create food energy from sunlight energy.

18. Fight or Flight? Check which response you think is expressed in each part of the table. Organisms response to threatFight response Flight response Zebra spots a lion sprinting toward him & he bolts A rat sees a human A rat is cornered by a human A possum threatened & plays “dead” A dog attacking the mailman A male Betta fish protecting his nest

19. Fight/Flight Response: An organism’s primitive, automatic, inborn response that prepare the body to “fight” or “flee” from perceived attack, harm or threat to its survival. This is a survival instinct.

20. What is the role of homeostasis in an organism? All organisms require an exact & unique set of environmental conditions to live in. Homeostasis (means equilibrium) is the ability to allow organisms to function properly.

21. What is the role of homeostasis in an organism? Homeostasis is needed when there are environmental changes that set the organism out of its conditions in order to maintain stability. Some environmental changes - External factors: Heat, light, temp. Internal factors: Lack of water

22. What is the role of homeostasis in an organism? Examples: If you are hot, then you sweat If you are cold, then you shiver If you are exercising, then you breathe faster to feed more oxygen to your muscles.

23. Stimulus & Response Classify each part of the scenario for “stimulus” or “response”. Underline the stimulus Circle the response

24. Stimulus & Response You touch something hot, so you move your hand away. Your don’t drink enough water, you become thirsty. A plant lacks water & light, so it becomes wilted. You eat spoiled food, so you get sick

25. Stimulus & Response If in a stressful situation, then you will fight for survival or flee for survival. If you consume too much liquid, then you have to urinate frequently. If you are hungry, then you eat. Lack of food, water, or shelter, then some animals migrate

26. Unit 10 Test Review 24 questions: Multiple Choice Covers: Stimuli (External & Internal) Homeostasis Topics have already been covered this year. Look back in your science journal.

27. Unit 10 Test Review Be able to recognize examples of stimuli (both external & internal) Be able to recognize examples of the responses to stimulus situations (both external & internal) Know the fight or flight response when given a scenario

28. Unit 10 Test Review Be able to recognize examples of homeostasis Know the “tropisms” & be able to identify examples of them(this includes knowing if it is a positive or negative response)