On Thursday and Friday we got to start our frog dissection in science class. We opened up the frog and tried to identify different organs on Thursday, and then we actually too out each separate organ on Friday. This was a cool experience, and it was also pretty fun. The only thing I didn't like was that the smell stuck on my hands the whole day!
I think that it was cool to see all of the different organs of the frog which made the dissection a good experience. I learned a lot doing this, and it gave me a better view of the internal frog. I was surprised at how small some organs such as the gall bladder were because I could barely find it. I also expected the heart to be bigger too for some reason. I definitely learned a lot from doing this dissection.
Recently we have been learning about amphibians in science class. The word amphibian means double life. What does that have to do with amphibians though? Well, amphibians literally live a double life. Their first life is lived in water as a tadpole, also known as the larvae stage. Larvae is when they are younger, and not mature. The transition into the second life is not immediate though. It happens over time, as the tadpoles undergo metamorphosis. Metamorphosis is when an amphibian loses its gills and develops lungs, allowing it to live on land. Then they leave the water and actually do live on land returning to the water only to lay their eggs.
When salamanders undergo metamorphosis they don't lose their tails like frogs and toads do. They also don't develop the strong hind legs for jumping that they do. In fact, larvae salamanders and adult salamanders look almost exactly alike. Frogs and toads lose their tails though and also develop stronger hind legs and skeletons. These are the basics of metamorphosis.
When light goes through the eye, the first thing it hits is the outer layer called the cornea. This outer layer protects the eye and it is the part that you can touch. Next, a controlled amount of the light passes through the pupil, or small black hole in the center of the iris. The iris controls how much light is allowed through the pupil
The next thing it hits is the lens, which refracts it toward the retina. The retina has two types of cells, cone and rod cells, which receive the light and create electric impulses from it. These electric impulses get sent to the brain via the optic nerve. Finally the brain forms an image which is the image that we see. This is what really happens with the eye, and is the complicated process of how we can see.
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