Animalscaretips
- What holds shells together?
- What is the name of the two muscles that work together to keep the shells closed?
- Which class of mollusk has two shells joined together for protection and uses a muscular foot for movement *?
- What are the 3 types of mollusk?
- What attaches muscle to shell?
- Do mussels have teeth?
- What is the technical term for a hinge connecting together 2 shells?
- What are Lake shells called?
- What is another method of defense for some mollusks besides a shell?
- Do all mollusks have shells?
- What phylum does shell belong to?
- Do mussels have tentacles?
- What type of mollusks have two shells?
- Do all cephalopods have shells?
What holds shells together?
A hinge ligament made of elastic protein joins the two halves of the shell together, and large adductor muscles between the two valves hold them closed. When the shell is closed, the top part of the hinge ligament is stretched and the lower part is compressed.
What is the name of the two muscles that work together to keep the shells closed?
The adductor muscle is used to hold the two shells together allowing the mussel to close its shell. The lateral teeth and pseudocardinal (pseudo = false) teeth are not used for chewing up food, but instead they are used to keep the two shells or bivalve together.
Which class of mollusk has two shells joined together for protection and uses a muscular foot for movement *?
Class Polyplacophora
The joints between these shell plates enable to chitons to roll up for protection. Chitons are mobile and contract their muscular foot in waves to move about.
What are the 3 types of mollusk?
The three major groups of mollusks are gastropods, bivalves, and cephalopods (SEF ul o pods). The largest group is the gastropods. These are mollusks like snails and slugs that have just one shell or no shell at all. Gastropods creep along on their broad foot.
What attaches muscle to shell?
Muscle cells connect with the shell through epithelial `tendon cells`, which have a cytoskeleton of actin microfilaments that connect to the extracellular matrix via focal adhesions.
Do mussels have teeth?
Some mussels have interlocking hinge "teeth" (pseudocardinal teeth and lateral teeth) on the inside of the shell to help keep the two valves in proper alignment. Other species are toothless.
What is the technical term for a hinge connecting together 2 shells?
A hinge ligament is a crucial part of the anatomical structure of a bivalve shell, i.e. the shell of a bivalve mollusk. The shell of a bivalve has two valves and these are joined together by the ligament at the dorsal edge of the shell.
What are Lake shells called?
Bivalves are very common in essentially all aquatic locales, including saltwater, brackish water, and freshwater. The shells of bivalves commonly wash up on beaches (often as separate valves) and along the edges of lakes, rivers, and streams.
What is another method of defense for some mollusks besides a shell?
The external cover that extends over the mantle may consist of a hardened epithelial layer called a cuticle, separate calcareous plates, or a shell. Another defense includes the ability of most solenogasters and chitons to roll the body up.
Do all mollusks have shells?
Mollusks usually have a shell (although some do not). Mollusks also have an extension of the body wall called the mantle. This portion of the animal's anatomy is responsible for secreting the shell. The mantle encloses the mantle cavity which contains the Ctenidia (gills), anus and excretory pores.
What phylum does shell belong to?
The mollusc (or mollusk) shell is typically a calcareous exoskeleton which encloses, supports and protects the soft parts of an animal in the phylum Mollusca, which includes snails, clams, tusk shells, and several other classes. Not all shelled molluscs live in the sea; many live on the land and in freshwater.
Do mussels have tentacles?
Mussels and clams are the silent among the molluscs. Most often we find them dug into the soil or clinging to rocks, where they filter their food from the water they breathe. ... With their long tentacles they truly do not resemble a silent river mussel. From the dawn of mankind humans have been harvesting mussels as food.
What type of mollusks have two shells?
Bivalves are mollusks with two shells such as clams and oysters.
Do all cephalopods have shells?
The most obvious difference between most cephalopods and other mollusks is the apparent lack of a shell. Octopuses do not have shells at all, while squids have a small internal shell. (Nautiluses, which are found in the South Pacific and Indian oceans, are the only cephalopods with an external shell.
