squid dissection

It seems to be on Fridays we do all the fun things but I don't mind, last Friday we got to dissect squids! Its really enjoyable and helpful to have a visual in front of me whenever we learn new units on bio. Last time when we did the earthworm dissection I was "Dr. Marissa" but this time it was Liz doing all the work while I was answering the questions. I learned/saw things I wouldn't think I was gong to find in a squid such as the beak, all the small organs or that they both had tentacles and arms! Although taking pictures of the squids organs was hard to tell what was what because everything was smushed together even having a clear picture beside us was kind of a challenge to point things out. When we found the pen I wasn't quite sure what it was because it really looked like plastic until I touched it it, thinking it would be flimsy I found out it was firm. Knowing we could write with the pen hense the name with the ink sac was pretty cool even though it broke right away. I learned squids have three hearts and they move tail first instead of head first in water. Here are some pictures i took and facts that I learned! (:

-How many arms does your squid have? How many tentacles?:
Our squid had 2 arms and 8 tentacles.
-Describe how tentacles and arms purpose differs. Describe the direction water comes out of the funnel and the direction the squid moves:
Arms are used to grab prey and hold on to it, the suckers on the tentacles aid to feed and grasp if the prey or object tries to escape. The squid moves opposite to the direction the jet is propelled from while the funnel collects water into the mantle cavity.
-Name two external features that are adaptions for the squids predatory life. How do these adaptations help the squid?:
1. They have a sharp beak that works as a shredder for food.
2. They either have small hooks or rings of teeth around their suckers.
-Name two traits that the squid shares with other mollusks:
Squids and mollusks both have a true coelom and bilateral symmetry.

-How many pairs of gills does the squid have?
Our squid had 2 gills in total.

-Where does the ink sac empty into and what is its function?:
The ink empties into the water to hide them selves, and surprise predators trying to eat it.

-What is the function of the pen? What would happen if the squid didn't have a pen?:
The pen is the squids bone structure which helps it keep stable to swim around, if the squid didn't have it its body would flop around and collapse on its self.
-How do you think wastes exit the squid?:
I think the squids waste would enter through the anus.

DR. Liz!