Aim: How Do Our Reflexes Function?

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Presentation transcript:

Aim: How Do Our Reflexes Function? DO NOW Quick Quiz Questions

Sense Organs How many do we have? What are they? All sense organs contain receptors groups of cells which are sensitive to a stimulus (ex. light, heat) For every stimulus there is a response

Sense Organs Visual

Receptors What kind of receptors are found in your eyes? What kind of receptors are found on your tongue? What kind of receptors are found in your ears? What kind of receptors are found on your skin?

Visual

Receptors Turn energy into electrical impulses that are transmitted along neurons Is this transmission a slow or fast process? Why?

Skin Receptor Examples

Reflex Arc A reflex arc allows for very quick responses Reflex actions are automatic or done without thinking Q: Is the brain involved? Q: What is the purpose of reflex actions?

Reflex Arc Example

Example #2 Bee stings your finger! Sting Stimulation of pain receptor on skin Message travels along sensory neurons Message passed along interneurons along spinal cord Message travels along motor neurons When message reaches muscle, it contracts!

Animation http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_21c/brain_mind/nervoussystemrev3.shtml

Video https://www.brainpop.com/health/bodysystems/nervoussystem/ https://www.brainpop.com/health/bodysystems/spinalcord/

Group Activity Work on handout distributed in class

Individual Activity Answer AIM

Homework Finish Handout Read txt. pgs. 552-557