Learning Targets Today I will describe the parts of a feedback loop.
Parts of a Feedback Loop Stimulus Receptor Control Center (or Integrator) Effector Response
Stimulus Something that causes a response. The child screaming was a stimulus for me to plug my ears.
Receptor Something that senses change. My ears were the receptors to the child screaming.
Control Center Something that makes sense of information. My brain made sense of the childs screams and told me to plug my ears.
Effector Something that acts in response to a stimulus. My hands were the effectors that plugged my ears.
Response A reaction to a stimulus. Plugging my ears was my response to the child screaming.
Negative vs. Positive Negative loops try to keep something in a certain range (such as body temperature). Positive loops will make something become more exaggerated. Most biological feedback loops are NEGATIVE.
Do Now If a feedback loop is negative, what does that mean?
Learning Targets: Content Target: Today I will build my own feedback loop using what I have learned. Language Target: Today I will use the vocabulary for a feedback loop.
Take a house… It has a furnace. The furnace is set at 68 degrees. What happens when the house gets warmer than 68 degrees? What happens when the house becomes cooler than 68 degrees?
Biology Example We are always right around 98.6 degrees in our bodies. We receive a stimulus of our environment warming up or cooling off. We have receptors in our blood vessels that tell our brains how warm we are. Our brain is the control center that makes sense of the information and decides to make us cool down or warm up. If we are too warm, our sweat glands act as effectors and make us sweat to cool off. If we are too cold, our muscles act as effectors and shiver to warm us up. Our response is to either warm up or cool down.
During our Respiration Lab… What do you think our body was trying to maintain? (What were we trying to get rid of?)
Carbon Dioxide When we exercise our _________give off carbon dioxide as a waste product. This increases the level of carbon dioxide in the blood. Receptors in the carotid arteries sense the change in carbon dioxide and send a message to the brain. The brain will stimulate the lungs to increase respiration. This will lower the amount of carbon dioxide in the blood
Now its your turn to build the loop… Choose something else our body tries to keep constant in our blood: ______oxygen_________ or _____sugar_________. Tell me what these things would be (if you dont know the technical name, describe what it might be): Stimulus Receptor Control Center (or Integrator) Effector Response
Summary Chart ActivityWhat I learned… Lets Wake up Some Yeast (Lab) Energy Vocabulary Cell Analogy Iodine Lab (Membrane, diffusion, molecules) Respiration Lab Dying to be Thin and Madelyns Story Feedback Loop