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Name: ____________________________________________________Period: ______Partner/s: ___________________________________________________Date: _______Activity: ReflexesObjectives:model neuron pathways involved in reflex actions, conscious sensations voluntary movements and memories. Apply knowledge by diagnosing sites of nerve damage for several patients. Materials: handout; red folders with other equipment internet; textbook pages 521-527, also pages 494-498Introduction: When you put your hand on a hot stovePart I: What is a reflex?Read the information below and then answer the questions that follow
Questions:1. What is a reflex? _______________________________________________________________________________ _______________________________________________________________________________________________ 2. What is the purpose for most reflexes? ___________________________________________________________________________________________________________________________________________________________ 3. Why are higher brain centers notinvolved in making reflex responses? ___________________________________ _______________________________________________________________________________________________ 4. State two (2)ways that reflex actions are differentfrom other actions such as walking, talking, or driving a car._______________________________________________________________________________________________ _______________________________________________________________________________________________ 5. Of the actions below, which are likely to be reflex responses to stimuli. Make with an X._____sneezing_____running_____blinking_____talkingPart II : Modeling aReflex Arc A reflex arc is a part of the nervous system involved in making a reflex response.Read the information in thehandout Biology Brief: A Reflex Arc , also refer totext page 521.Using the Wikki Stix in your folder as "neurons" and the Body Diagram handout, make a modelof the neurons in a reflex arc on the Body Diagram. *****leave the wikki stix on the diagram!!!1. What is the stimulus that triggers the "hand on a hot stove" reflex ? _____________________________________ ____2. Place the red bead in the appropriate location on the Body Diagram handout to represent a receptorthat detects the stimulus.3. Whichtype of neuron conducts the impulse from the receptor to the spinal cord? _______________________________4. Arrange the red Wikki stix on the Body Diagram handout to show a sensory neuronthat connects the receptor to the spinal cord.**NOTE** Press the Wikki Stix down firmly so it sticks to the diagram.5. What is the function of a sensory neuron? ___________________________________________________________ ________________________________________________________________________________________________ 6. Which type of neuron conducts the impulse from a sensory neuron to a motor neuron? ________________________ ____7. Arrange the green Wikki stix on the Body Diagram handout to show an interneuronin the spinal cord.8. What is the function ofaninterneuron? _____________________________________________________________ ________________________________________________________________________________________________ 9. Which type of neuron conducts the impulse from the spinal cord to an effector? ________________________________10. Arrange the lightblue Wikki stix on the Body Diagram handout to show a motor neuron. 11. What is the function ofa motor neuron? __________________________________________________________ _______________________________________________________________________________________________ 12. What is the effectorin the reflex that allows you to automatically move your hand away from the hot stove? _______________________________________________________________________________________________ 13. What is the function of the effector? _____________________________________________________________ _______________________________________________________________________________________________