Monday, February 29, 2016

Unit 6 Reflection

Unit 6 was primarily about the skeletal system. I found this unit really interesting because I felt like I was enjoying what I was learning more than usual. I learned that the skeleton has 206 bones and that there are different types of bones: long bone, short bone, flat bones, and irregular bones. The skeletal body has 2 divisions: axial and appendicular. We also learned about joints. A joint is the point of connection between 2 bones or elements of the skeleton.
We also did a really cool lab, the owl pellet lab. We observed and used tools to look inside an owl pellet, which is something an owl vomits that could not be digested. We found remains of a dead mole and vole in out pellet which was really cool!
Below are pictures from the lab.
In this unit, I did wonder how so many bones could work in the body and the function of each. I will definitely look into the bones in the body when I have free time because it really was captivating.

Thursday, February 25, 2016

Owl Pellet Lab

We dissected an owl pellet which is basically what an owl throws up. In the pellet, we saw many things like fur and bones and what looked like dirt. The organisms in our pellet were a mole. We knew that there was a mole because we saw the pelvis bone and it looked just like the one in the manual. This was really cool because we found a socket and imagined as if it were actually being a joint.

 
We also found parts of the mole's vertebrae and we know is was a mole and not a bird because the pieces were bigger than those a bird would have.

The skeleton of a mole could be similar and different to those of a human. Its different in a way that the pelvis is lower and different because the animal goes on four legs whereas the humans are on two. Also, the vertebrae of the animals are smaller and there are less bones to it. The pelvis and joints thought work in the same way as humans in that the socket is what helps the movement. Also, they both have ulna and radius and tibia and fibula in the arms and legs that one looks smaller than the other. The moles, though, are on opposite sides where the radius and ulna are switched. In the mole and in the human, the skull looks the same.
Below are some pictures from the dissection!