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Digestive enzymes are secreted into the lumen of these glands. Additional extracellular digestion takes place in the stomach. In cephalopods, digestion is entirely extracellular. In the most other mollusks, the terminal stages of digestion are completed intracellularly, within the tissue of the digestive glands.Although in molluscs the digestive gland is considered the main site of nutrient absorption, intracellular digestion and storage of reserves, these functions are shared with epithelial cells of the digestive tract [26] .6. 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.
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Is digestion intracellular or extracellular in Mollusca?
Although in molluscs the digestive gland is considered the main site of nutrient absorption, intracellular digestion and storage of reserves, these functions are shared with epithelial cells of the digestive tract [26] .
What type of digestion do molluscs have?
6. 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.
DIGESTIVE STRUCTURES IN BIVALVIA PHYLUM MOLLUSCA
Images related to the topicDIGESTIVE STRUCTURES IN BIVALVIA PHYLUM MOLLUSCA
What animals use intracellular digestion?
Some animals use intracellular digestion, where food is taken into cells by phagocytosis with digestive enzymes being secreted into the phagocytic vesicles. This type of digestion occurs in sponges, coelenterates (corals, hydras and their relatives) and most protozoans.
Are molluscs internal or external?
Molluscs that use such a system remain of one sex all their lives and rely on external fertilization. Some molluscs use internal fertilization and/or are hermaphrodites, functioning as both sexes; both of these methods require more complex reproductive systems.
Do molluscs have a digestive system?
Mollusks have a radula for grinding food. A digestive gland is connected to the stomach. The tissue beneath the shell is called the mantle. The digestive system includes a gizzard, a stomach, a digestive gland, and the intestine.
What organisms use extracellular digestion?
In extracellular digestion, the materials or food particles are broken down chemically into smaller components outside the cell or onto the digestive system spaces. For example, fungi feed on their food by secreting digestive enzymes to digest their food externally, which they later absorb.
Is fertilization in molluscs external or internal?
Molluscs have extreme variation in reproductive characteristics. A generic mollusc is dioecious with paired gonads. Eggs or sperm are released into the coelomic cavity and carried outside by ducts. Fertilization is external and the zygote develops into a gastrula and then a free-swimming trochophore larva.
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Structure and function of the digestive system in molluscs
Consequently, their digestive system presents many adaptive variations. The digestive tract starting in the mouth consists of the buccal cavity, …
Digestion in Molluscs and Arthropods
Materials are then digested intracellularly by the cells lining the digestive … The squid have a long esophagus that carries material to the stomach.
BIO 5 GENERAL BIOLOGY
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 …
Structure and function of the digestive system … – ResearchGate
Although in molluscs the digestive gland is considered the main site of nutrient absorption, intracellular digestion and storage of reserves, these functions …
Is digestion intracellular or extracellular in arthropods?
The insects and the crustaceans (e.g., crayfish, crabs, and shrimp) nicely illustrate the digestive system of arthropods (Figure A). In them, digestion is principally extracellular. Another similarity to vertebrates is that food is moved through the insect or crustacean digestive tract by muscular contraction.
What do all mollusks have in common?
Molluscs are a clade of organisms that all have soft bodies which typically have a “head” and a “foot” region. Often their bodies are covered by a hard exoskeleton, as in the shells of snails and clams or the plates of chitons.
In which animal we can find both intracellular and extracellular digestion?
Cnidarians perform extracellular digestion. All the digestion processes completed in the intracellular region. Food absorbed in the gastrovascular cavity and nutrients absorbed by the cell lining of the cavity. Flatworms have conspicuous digestive systems.
Do sponges have intracellular or extracellular digestion?
Lacking a true digestive system, sponges depend on the intracellular digestive processes of their choanocytes for their energy intake. The limit of this type of digestion is that food particles must be smaller than individual cells.
Which of the following organisms digestion is extracellular followed by intracellular?
Both intracellular and extracellular digestion occurs in planaria.
Mollusca | Gastropods-Bivalves-Cephlapods |
Images related to the topicMollusca | Gastropods-Bivalves-Cephlapods |
Are mollusks unicellular or multicellular?
Yes, molluscs are all multicellular. These animals develop from a single-celled zygote into sometimes large and complex animals.
What is the difference between molluscs and mollusks?
For the noun denoting animals of the phylum Mollusca—which includes squid, octopuses, slugs, and snails—mollusk is the preferred spelling in North America, and mollusc is preferred throughout the rest of the English-speaking world.
Are mollusks Heterotrophs or Autotrophs?
Yes, all mollusks are heterotrophic, because mollusks are animals, and all animals are heterotopic, meaning that they need to consume organic carbon…
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 mussels have a digestive system?
Internal organ systems include an open circulatory system powered by a heart; a digestive system that consists of mouth, stomach, gut, and anus; a decentralized nervous system that controls movement of the foot and adductor muscles; and reproductive organs that usually occur separately in male and female mussels.
How do mollusks get food?
Herbivorous mollusks use the radula to scrape food such as algae off rocks. Predatory mollusks use the radula to drill holes in the shells of their prey. Mollusks have a coelom and a complete digestive system.
Do earthworms have intracellular digestion?
Extracellular Digestion
Most other invertebrates like segmented worms (earthworms), arthropods (grasshoppers), and arachnids (spiders) have alimentary canals. The alimentary canal is compartmentalized for different digestive functions and consists of one tube with a mouth at one end and an anus at the other.
Do flatworms use intracellular digestion?
Physiological Processes of Flatworms
Some species also have an anal opening. The gut may be a simple sac or highly branched. Digestion is extracellular, with enzymes secreted into the space by cells lining the tract, and digested materials taken into the same cells by phagocytosis.
What is intercellular and intracellular digestion?
Intercellular digestion. The process of digestion that takes place within the cell is referred to as intracellular digestion. The process of digestion that takes place outside the cell in the cavity of the alimentary canal is called intercellular digestion.
How does mollusk reproduce?
Mollusks are primarily of separate sexes, and the reproductive organs (gonads) are simple. Reproduction via an unfertilized gamete (parthenogenesis) is also found among gastropods of the subclass Prosobranchia. Most reproduction, however, is by sexual means.
What is EXTRACELLULAR DIGESTION? What does EXTRACELLULAR DIGESTION mean?
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Which of the following is true about reproduction in Mollusca?
Some species of mollusc are hermaphrodites that reproduce by internal fertilization. Therefore, option C both sexual and asexual reproduction is the correct answer. So, option C is the correct option.
How do mollusks reproduce asexually?
Mollusk reproduce asexually by being hermaphroditic where they are both male and female they also asexually reproduce by budding.
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