Today's Quote:
Recap:
Unfortunately, I could not update the blog yesterday as the construction crew in my subdivision cut through the cable so we had to wing it.
8th graders did their time trial and should have calculate their car seed and afterwards, I went over how to graph that motion. I reminded the class that the independent variable, in this case, time, should always be graphed on the X- axis and that even if their car did not move, that could still be graphed as time continued to move.
In 7t grade we began notes over he circulatory system and students were assigned a color plate to do for homework. It is due today. We pointed out that there are two types of circulatory systems; open, like in grasshoppers where there are no vessels but the movement and breathing of the organism is how blood bathes the tissues and removes waste and carries nutrients. Since grasshopper blood has no hemoglobin, it is clear , not red. The other type of circulatory system is a closed system like we find in earthworms, frogs and humans. In this system blood is under pressure and therefore carried in tubes called vessels In a closed system, a chambered heart pumps blood through a series of vessels with specialized valves that prevent regurgitation (definition 3). Arteries are the vessels that carry oxygen-rich blood away from the heart and out to every single cell in the body and veins are the vessels that carry deoxygenated blood back to the heart and lungs to be reoxygenated. Blood reaches every cell through tiny vessels called capillaries which are very fine vessels that connect arteries to veins to complete the cycle. We demonstrated capillary action by pressing on our nail bed and watching it turn white, then removing the pressure to watch it quickly turn red again as blood flowed back into the capillaries under the nail.
Brain Bender:
Little Suzie is afraid of monsters hiding under her bed. She usually runs froom her bedroom door and leaps onto her bed so the monsters can't get her. Even though Suzie's bed is twelve feet from the door, she manages to switch off her light and jump into bed before her room is dark. Since Suzie doesn't use any device to flip the switch, how is she able to accomplish this amazing feat?
Today's Agenda:
8th grade honors
Demo: Setting the table. Explain this in terms of force exerted on objects.
Lecture: Newton's First Law Newton's Three Laws
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7th Grade honors
Continue Circulatory System lecture
Homework: Watch The Circulatory System
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