Last week, we dissected a  frog! The most memorable thing was the smell in the classroom. When I walked in side, I was about to say "What died in here" but I saw the frogs and thought better of it.  My group  got a boy frog to dissect  but we still got too see the eggs. The frog had a liquid (which I later learned was preservatives) that kept on spilling out. The fat bodies were yellow and noodle-like, which was pretty cool to me but no one else in my group seemed to care. After removing the fat bodies, we saw the frog's organs, or what was left of them. You see, my group mates decided to cut open  the frog in a completely rubbish manner. So some of the organs, like the liver , were damaged. The gallbladder was alright but it stained the liver green.                                                                                                           I liked dissecting the frog and I can't wait to dissect more things later on!

Quiz Time!!!!

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Yesterday and today in class, we observed the digestion of an egg. Not a real digestion though! The whole science class had been placed into groups that worked together to observe 4 test tubes.The test tubes were filled with different substances and they all had 3 cubes of egg white. Test tube A contained 10 mL of pepsin. B held 5 mL of pepsin and 5 mL of water.C was filled with 10 mL of hydrochloric acid while D had 5 mL of pepsin and 5 mL of hydrochloric acid.Then we looked at the egg whites in all the tubes and my group saw that none of the egg whites were different. Then we put drops of  what was inside the tubes onto strips of litmus paper, which told if the item inside each test tube was acidic or not. The second day, we tested the test tubes and saw that some of the egg whites were beginning to be digested, though when the litmus paper was tested, it had the same results as the first day.

On Thursday, October 20, My science class did a chicken wing  lab. It was pretty cool!. The teacher cut back the peachy skin, which was attached to muscle. She showed us how the flexor muscle bends the joints in a chicken wing and the extensor lengthens the bone by pulling on the muscles, which worked perfectly! Then, onto the shiny, white tendons, which attach muscles to bones.We found cartilage and ligaments but sadly not nerves.The teacher also cracked the bone in half and showed us the bone marrow. Our class also found the differences and similarities between human anatomy and a chicken wing's anatomy.

Diffusion, Science Lab Green

         On October 13, 2011 in a science lab, an experiment was done. The labs purpose was to show how the cell membrane allows certain substances to travel in and travel out. The experiment involved predicting what might happen; such as if the plastic baggie were permeable to starch, the starch would move into the bag. Another prediction was that if the bag was permeable to iodine, it would move out of the bag; if the plastic baggie was permeable to iodine, the solution inside the plastic baggie would turn purple and the solution in the beaker would stay the same. The last prediction made was that if the baggie was permeable to starch, the solution in the baggie would turn golden and the solution in the beaker would turn purple. What also happened was diffusion (the process by which molecules move from an area of high concentration to an area of low concentration) and osmosis (the diffusion of water molecules through a selectively permeable membrane). The indicator (a substance that changes color in the presence of the substance it indicates) iodine was used on starch and it made the starch solution in the baggie hypertonic (high concentration) and the beaker became hypotonic (lower concentration) in relation to starch. None of the solutions were isotonic (equal concentration).

         The lab was done easily. Filling a baggie with a teaspoon of cornstarch and half a cup of water and tying the bag? Not a problem. Filling a beaker halfway with water and adding then drops of iodine? Hah! Like that would ever be a dilemma. Placing the baggie in the in the beaker so the cornstarch is completely in the iodine/water mixture? Kind of cool. But waiting fifteen minutes to see what would happen?! That was almost forever! But the experiment was worth the wait.

      This experiment, like written before, involves diffusion. Some examples of diffusion are cigarette smoke (it diffuses into the air and spreads around the room), a drop of food coloring in water (it gradually diffuses throughout the water), oxygen (diffuses from the air sacs in lungs into blood capillaries), and helium (it diffuses through the membrane of a balloon, causing the balloon the stop floating).