Is their digestive tract complete or incomplete?

Asked by: Chris Boamah

Is there digestive tract complete or incomplete? Explain. Incomplete, because they have one opening (mouth & anus have the same opening).

Is their digestive tract complete or incomplete clam?

complete

Clams (and all mollusks) have a complete digestive system. It consists of a mouth where food is ingested, a short connecting tube called the esophogus, a stomach which temporarily holds food, and an intestine where food digestion and absorption takes place.

What is incomplete digestive tract?

An incomplete digestive system consists of a digestive cav ity with one opening. The single opening serves as both mouth and anus. A complete digestive system consists of a digestive tract with two openings. One opening is the mouth. The other is the anus.

Which of the following have a complete digestive system?

All mammals, like dogs, cats, and humans; reptiles, amphibians, fish, birds, and even insects have complete digestive systems.

Is bivalves digestive tract complete?

Members of the order Septibranchia, however, lack gills and feed on small crustaceans and worms. Bivalves have a complete digestive tract; a reduced nervous system; a complete, open circulatory system with a chambered heart, arteries, veins, and blood sinuses; and excretory and reproductive organs.

Is a bivalves digestive tract complete or incomplete Why?

They are called bivalves because their shell is composed of two parts that are called valves. Is there digestive tract complete or incomplete? Explain. Incomplete, because they have one opening (mouth & anus have the same opening).

Do clams feel pain?

Yes. Scientists have proved beyond a doubt that fish, lobsters, crabs, and other sea dwellers feel pain. Lobsters’ bodies are covered with chemoreceptors so they are very sensitive to their environments.

Do humans have a complete digestive system?

Humans have a complete digestive system with specialized organs, like the stomach and small intestine, that do different jobs, allowing for more efficient absorption of nutrients.

Who has incomplete digestive tract?

This type of digestive system is also called an incomplete digestive tract. Platyhelminthes (flatworms), Ctenophora (comb jellies), and Cnidaria (coral, jelly fish, and sea anemones) use this type of digestion.

Why is a complete digestive system more efficient than an incomplete digestive system?

The single opening in an incomplete digestive system serves as both the mouth and the anus. In a complete digestive system, the mouth and anus are independent of one another. Humans have a complete digestive system where food enters through the mouth, is digested, and is then expelled through the anus, as waste.

Do snails have a complete digestive system?

The alimentary tract of land snails is remarkably simple, possibly because of terrestrial life styles. The alimentary canal is usually divisible into buccal mass, esophagus, crop, stomach, intestine and rectum along with appendages like salivary and digestive glands (hepatopancreas) [55].

Do oysters have a digestive system?

Oysters are filter feeders, and take in all different types of particles from the water column. As oysters digest food, waste collects in a cavity inside their shell. Besides to actual waste, items called pseudofaeces also collect there. Pseudofaeces are things like sand or large pieces of food the oyster can’t digest.

How do gastropods differ from bivalves?

Comparing Bivalves and Gastropods

Bivalve shells are made of two pieces connected at a hinge. So, if you find a shell with a hinge, it must be a bivalve. Gastropods are one piece and usually have a spiral on the end.

Is an octopus a mollusk?

octopus, plural octopuses or octopi, in general, any eight-armed cephalopod (octopod) mollusk of the order Octopoda. The true octopuses are members of the genus Octopus, a large group of widely distributed shallow-water cephalopods.

How do cephalopods feed?

All living cephalopods have a two-part beak; most have a radula, although it is reduced in most octopus and absent altogether in Spirula. They feed by capturing prey with their tentacles, drawing it into their mouth and taking bites from it.

What do cephalopods octopus and gastropods snails have in common?

Cephalopods and gastropods are two classes belonging to the phylum Mollusca of Kingdom Animalia. They have coiled shells. Both groups include aquatic animals. They are invertebrates.

What is a gastropod fossil?

Gastropods are snail-like and slug-like invertebrate (lacking a backbone) animals, and are types of mollusks. Snails have hard mineral shells; slugs lack shells. Because fossils mostly represent the hard parts of organisms, snails are the most common types of gastropod fossils.

How do bivalves move?

Some bivalves have a pointed, retractable “foot” that protrudes from the shell and digs into the surrounding sediment, effectively enabling the creature to move or burrow. Bivalves even make their own shells.

What typical structure of mollusks are the arms and tentacles derived from?

Mollusks in which typical molluscan foot surrounds head and forms arms and tentacles; mantle surrounds mantle cavity and is part of locomotory system; central nervous system highly developed, forming true brain encased in cartilaginous cranium; mouth contains pair of parrotlike jaws (or beak); body usually somewhat …

Which of the following structure helps in excretion and respiration in molluscs?

The mantle cavity is formed between the mantle tissue and the body of the animal. This cavity serves as a water pumping station for aquatic mollusks. It contains gills used for respiration and exit pores for the digestive, excretory, and reproductive systems.

How does the modification of the molluscan foot in gastropods and cephalopods relate to their respective lifestyles?

How does the modification of the molluscan foot in gastropods and cephalopods relate to their respective lifestyles? The gastropod foot allows these organisms to move along a substrate in either terrestrial or aquatic environments. The cephalopod foot is modified into an excurrent siphon and tentacles.

What is visceral hump?

The visceral hump, or visceral mass, of gastropods is always contained within the shell; it generally holds the bulk of the digestive, reproductive, excretory, and respiratory systems. A significant part of the visceral hump consists of the mantle, or pallial, cavity.

What is mantle cavity?

Definition of mantle cavity

: the cavity between the mantle and the body proper of a mollusk or brachiopod in which the respiratory organs lie.

What class is mollusk?

The Class Gastropoda (in Phylum Mollusca) includes the groups pertaining to snails and slugs. The majority of gastropods have a single, usually spirally, coiled shell into which the body can be withdrawn.

What family is a slug in?

Gastropoda

Are slugs unisex?

Slugs are hermaphrodites, having both female and male reproductive organs. Once a slug has located a mate, they encircle each other and sperm is exchanged through their protruded genitalia.

Do slugs bite?

Slugs do not bite in a traditional way. Yet, they use a ribbon-like organ to scrape rocks and other surfaces, which can include human skin. Slug bites are not as dangerous as you would think. Among the few occurrences of slug bites, only some people experienced tingling and pulsation in the bitten area.