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How Stress Affects the Brain - 5/13/17

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Summary : Stress takes a variety of forms. Some stress happens as the result of a short-term event such as having an argument with a loved one. Other stress happens due to recurring situations, such as working a demanding job. When recurring situations cause stress that is both intense and sustained over a long period of time, this is known as chronic stress. Even though all stress triggers physiological reactions, chronic stress is a big problem because of the significant harm it can do to the body and the brain. When someone experiences a stressful event, an area of the brain that contributes to emotional processing sends a distress signal to the hypothalamus. This area of the brain functions like a command center, communicating with the rest of the body through the nervous system so that the person has the energy to fight or flee. This “fight-or-flight” response is responsible for the physical reactions most people correlate with stress including increased heart ...
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Musical Waves Project Blog - 4/22/18

Summary : The relationship between frequency and pitch is that frequency influences pitch. If there is a low frequency, there will be a low pitch. A wave changes with a change in the pitch because the higher the pitch the shorter the wavelength. The appearance of the wave changes with a change in the volume because the louder the sound, the larger the amplitude. When you play higher notes, the waves are closer together. Yet, when you play louder, the waves are taller. Backward-Looking: How much did you know about the subject before we started? Before we started this unit on musical waves I knew next to nothing about how musical instruments worked. I knew you could tune them and amplify them but I didn't know that vibrations created sound and how these vibrations were made. Another thing I didn't know about this subject before we started was the difficulty of construction for some instruments and how much precision goes into making musical instruments. Inward-Looking: What...
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Evolution Mastery Quest 2 Regrade - 11/13/1 7

Question : Which of the following questions can be answered by studying these fossil layers? Wrong Answer: What are the common ancestors of fish? Correct Answer: Which organisms lived before/after/or at the same time? Why the correct answer is correct: The reasoning as to why "Which organisms lived before/after/or at the same time?' is the correct answer is because you can use relative dating to see which organisms are younger or older compared to one another.
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