| A | B |
|---|
| Water | What substance contains the oxygen which marine animals need to breathe? |
| Gills | What part of the body is used to get the oxygen from the water so the squid can breathe? |
| Heart | What part of the squid is used to pump blood throughout its body? |
| What do the gills look like? | Two white feathery structures along each side of the mantle cavity. |
| How do the gills work? | Oxygenated water entering the mantle cavity used for jet propulsion also bathes the gills. |
| How many hearts do squids have? | Two brachial hearts and a third larger heart, the systemic heart. |
| Where are the squid's 3 heart located? | In between the gills - the large heart is in the middle with 2 smaller ones on each side. |
| What color is squid blood? | Blue when it is oxygenated and colorless when it's without oxygen. |
| What's another term for pen? | Gladius |
| What does the pen do? | It supports the squid as it jets through the water. |
| Where is the pen? | It runs the entire length of the mantle on the dorsal side (like a backbone). |
| What is the pen made of? | Chitin, like the beak. |
| What does the pen look line? | A clear feather or thin piece of clear flexible plastic. |
| What has the pen evolved from? | The hard shell that once protected its ancestors. |
| Where does the brain lie? | Right between the eyes and surrounding the esophagus. |
| What is special about the squid and octopus brain? | It is highly developed, and squid are considered the most intelligent of all the invertebrates. |
| What does the brain consist of? | Many bundles of nerves fused together and surrounded by a skull made of cartilage (like your nose). |
| What makes possible the squid's incredible speed (in addition to the funnel)? | An unusual set of nerves and nerve fibers called axons which run down both sides of the mantle. |
| What happens when the nerves and axons contract the mantle? | Water is forced out of the body and the squid jets away from danger or towards prey. |
