What is the basic body plan of a mollusks?
- 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.
- The Visceral Mass.
- Shells.
What is the three part body plan of a mollusk?
What is the body plan of mollusks?
- 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.
- The Visceral Mass.
- Shells.
Do mollusks have a pseudocoelomate body plan?
pseudocoelomate: any invertebrate animal with a three-layered body and a pseudocoel; ... Mollusks have a muscular foot used for locomotion and anchorage that varies in shape and function, depending on the type of mollusk under study. ... Members of class Gastropoda have an asymmetrical body plan and usually have a shell, which can be ...
What is the life cycle of a mollusk?
Life Cycle. The life cycle of a Mollusk starts with a sperm cell. penetrating an egg cell, which, when fertilized, divides. The next stage is the Trochophore stage, followed by the. Veliger, in early stage. The Veliger stage post torsion is. next, followed by the Veliger in settlement stage.
What are the four main body parts of most mollusks?
- Head-foot: this is the body part that is in charge of both sensing and locomoting.
- Visceral mass: this is the body part that contains all the organ systems.
- Mantle: this is the body part that covers the whole visceral mass and it is also what secretes the shell for those mollusks that have one.
What are the basic features of the mollusk body?
Main characteristics of Mollusca : Unsegmented soft body with bilateral symmetry. Presence of an internal or external shell. A toothed tongue (made mostly of chitin) called the radula. A mantle which is a fold in the body wall that lines the shell.
What are the three parts of the mollusc body plan?
The three distinct parts of molluscs are the head, muscular foot and visceral hump.
What are the 4 main body parts of mollusks?
The four important body parts in the mollusk could be listed as: Shell, Mantle, Visceral Mass and Foot.
What three components make up the body plan of mollusk quizlet?
The three parts that make up the basic mollusk body plan are the visceral mass, the mantle, and the foot. The visceral mass is the central section of the mollusk's body that contains the mollusk's organs.
What are the 3 body parts that are found in every mollusk in some form what is the function of each of these body parts?
Despite their diversity, mollusks share in common a three-part body plan that includes a head, a foot and a visceral mass.The Head. i. The mollusk's head region contains the brain. ... The Foot. i. A mollusk has a "foot," the body's muscular section, responsible for movement. ... Shells. i.
What are the 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.
Which set of body parts does every mollusk have?
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). The mantle also contributes to formation of gills or lungs.
What is the body plan of a mollusk?
Body Plan. Mollusks have a thin layer of tissue called the mantle. The mantle covers the body organs, which are located in the visceral mass. Between the soft body and the mantle is a space called the mantle cavity. Mollusks contain gills. Gills are organs in which carbon dioxide from the mollusk is exchanged for oxygen in the water.
What are the organs of a mollusk?
Mollusks contain gills. Gills are organs in which carbon dioxide from the mollusk is exchanged for oxygen in the water. The mantle also protects the body if the mollusk does not have a shell. the shell is made up of several layers. The inside layer is the smoothest but it is usually the thickest layer because it's added to throughout the life ...
Which layer of the body is the smoothest?
The inside layer is the smoothest but it is usually the thickest layer because it's added to throughout the life of the mollusk. The inside layer protects the soft body. The circulatory system of most mollusks is an open system. In an open circulatory system, the heart moves blood out into the open spaces around the body organs.
Do mollusks have tentacles?
Most Mollusks have a well-developed head with a mouth and some sensory organs. Some Mollusks, such as the squid, have tentacles. The muscular foot, which is used for movement, is in the underside of the mollusk.
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Why is the inside layer of a mollusk the smoothest?
The inside layer is the smoothest but it is usually the thickest layer because it's added to throughout the life of the mollusk. The inside layer protects the soft body. Some Mollusks, such as the squid, have tentacles. The muscular foot, which is used for movement, is in the underside of the mollusk.
What type of symmetry do mollusks have?
The type of symmetry that mollusks have is bilateral symmetry. Meaning that the two sides are related. The picture shows muscular foot,visceral mass and the mantle. The mantle is a layer of tissue that covers the visceral mass and in many molluscs it contains glands which secrete a hard shell. Mollusks reproduce sexually.
What is the mantle of a mollusk?
Mollusks have a thin layer of tissue called the mantle. The mantle covers the body organs, which are located in the visceral mass. Between the soft body and the mantle is a space called the mantle cavity. Mollusks contain gills.
