What are the 3 main body parts of a mollusk?

What are the 3 main body parts of a mollusk?

In general, mollusks have 3 body regions: a head, a visceral mass, and a “foot.” The head contains the sense organs and “brain,” while the visceral mass contains the internal organs. The “foot” is the muscular lower part of the body which is in contact with the substrate.

What are 4 of the unique structures found in mollusks?

Mollusks have a hard outer shell. There is a layer of tissue called the mantle between the shell and the body. Most mollusks have tentacles for feeding and sensing, and many have a muscular foot. Mollusks also have a coelom, a complete digestive system, and specialized organs for excretion.

What type of body does mollusks have?

The Mollusk body first appeared during the Cambrian Period. All mollusks have: a visceral mass containing internal organs, including the digestive tract, paired kidneys, and reproductive organs. a mantle that surrounds but does not cover entirely the visceral mass and secretes a shell (if one is present).

What four basic body structures do almost all mollusks have?

There is a layer of tissue called the mantle between the shell and the body. Most mollusks have tentacles for feeding and sensing, and many have a muscular foot. Mollusks also have a coelom, a complete digestive system, and specialized organs for excretion. The majority of mollusks live in the ocean.

How do mollusks breathe?

Essentially all molluscs inhale by gills that are called ctenidia (comb gills) on account of their brush-like shape. In earthbound molluscs this breath organ is decreased, yet at the same time breath happens in the pallial cavity.

Where do tusk shells live?

Most tusk shells live in fairly deep water, sometimes to depths of about 4,000 metres (13,000 feet); many deep-sea species are cosmopolitan in distribution.

What does a moon snail do with its foot?

The foot expands to the point where it actually engulfs the entire shell. The moon snail’s foot not only helps it to glide along the surface but also to dig underground, a place where this animal spends most of its daylight hours. The shot above is spectacular in the way that it shows how this snail digs.

What do tusk shells eat?

The posterior end admits water for respiration and discharges wastes. Tusk shells feed upon such small organisms as protozoans of the order Forminifera and young bivalves. Sexes are separate, and the eggs develop into free-swimming trochophore larvae.

What kind of body plan does a mollusk have?

Despite their diversity, mollusks share in common a three-part body plan that includes a head, a foot and a visceral mass. The Head. The mollusk’s head region contains the brain. The Foot. A mollusk has a “foot,” the body’s muscular section, responsible for movement.

Which is part of a mollusk contains the brain?

The Head. The mollusk’s head region contains the brain. The Foot. A mollusk has a “foot,” the body’s muscular section, responsible for movement. Shells. Subsequently, question is, what are the 4 parts of mollusks?

What are the gills of a mollusk made of?

Mollusk gills are called ctenidia, and they are made up of a series of thin filaments of tissue that resemble the teeth of a comb. These filaments absorb oxygen from water and transfer it to the blood stream. They also receive carbon dioxide from the blood and release it into the surrounding water.

How does the excretory system of a mollusk work?

The excretory system of mollusks is made up of tubular organs called nephridia that filter waste from internal body fluids. Waste generated by cells within the organism is dumped into the coelom, the fluid-filled internal body cavity.