What are the structures involved in bivalves’ filtration feeding? Explain the process?
What are the structures involved in bivalves filtration feeding? Food . Bivalves are filter feeders, they feed on particles suspended in the water that enter through the siphon and are directed by cilia to the gills so that filtration can be carried out. After filtration, the particles are directed to the labial palps that transport them to the mouth.
What is the shell’s diet?
Food and Digestive System Food is carried through the digestive tube, where it is acted upon by enzymes. Nutrients are absorbed and distributed throughout the body through the blood. Cephalopods and gastropods have a radula, a type of tongue with sharp teeth, used to scrape food .
What is the function of the mollusk shell?
The shell’s main function is to protect the mollusk ‘s body . When it feels threatened, the mollusk can hide its entire body inside. Shells also have other purposes. Some have protrusions that keep the animal anchored to the ocean floor.
Are these characteristics that occur in all representatives of molluscs?
Mollusks form, after arthropods, the second largest phylum of metazoans in terms of number of species . These are characteristics that occur in all representatives of molluscs : * dorsal nervous system and differentiated head. radula and visceral mass. open circulatory system and mantle.
What is the body of a mollusk like?
Molluscs are soft – bodied invertebrate animals that, for the most part, have protective shells. Some species, such as octopuses and slugs, do not have a shell; and in others, such as squid, the shell is internal and reduced.
How can we divide the body of a mollusk?
Molluscs have a body made up of three main parts:
- Muscular foot: as the name suggests, it is a muscular structure that helps the animal in its locomotion.
- Visceral mass: this is the region of the animal’s body where most of its internal organs are located.
What are the body parts of a mollusk?
Response. Hello! Molluscs are animals that have a soft body and are normally surrounded by a calcareous shell. The three basic parts that make up the body of molluscs are : head, foot and visceral mass.
How is a mollusc’s nervous system organized?
The nervous system of molluscs is centralized and ganglionic, with three parts of nerve ganglia from which nerves exit to different parts of the body. … Cephalopods have a large cerebroid ganglion, which resembles the brain of vertebrates.
How is the nervous system of arthropods organized?
The nervous system of arthropods is of the ganglionic type, featuring a double ventral chain of ganglia, and very specialized sense organs located in the head (eyes, hearing organs and antennae). This greater concentration in the head of nerve structures is known as cephalization.
How does the echinoderm nervous system work?
Echinoderms have a simple radial nervous system consisting of a modified nerve network (interconnected neurons with no central organ) and nerve rings composed of radial nerves around the mouth extending down each arm.
How does the circulatory system of molluscs work?
Most molluscs have an open circulatory system , although some cephalopods have a closed circulatory system . They have a heart inside the pericardial cavity that pumps hemolymph (similar to blood) to transport substances throughout the organism’s body.
How does the circulatory system of annelids work?
Annelids have a closed circulatory system . … The circulatory system is made up of two vessels, one dorsal and one ventral, in addition to a set of contractile vessels, which can be compared to hearts.
How does the open circulatory system work?
– Open circulatory system : This is the type of system in which blood fluid, also called hemolymph, also circulates outside vessels, falling into cavities and gaps between organs. In these gaps, the blood meets the cells directly, exchanges substances and returns to the heart.
What is the circulatory system of echinoderms like?
In echinoderms , the circulatory system is generally not present, but when it is, it is rudimentary. There is a colorless liquid that circulates through the channels found throughout the body of these animals, and this liquid performs the functions of blood, that is, it transports substances throughout the body.
How to recognize an echinoderm?
The word “ echinoderms ” comes from the Greek and means echinos = thorn; dermatos = skin, that is, echinoderms are animals that have their entire bodies covered in spines. These, in addition to having a defense function, also act on the animal’s locomotion.
What are the general characteristics of echinoderms?
Echinoderms (Phylum Echinodermata) are marine animals that move slowly or are sessile. They have an endoskeleton made up of calcareous plates and, for the most part, they have pointed projections (which come from this skeleton) and spines.
Which of these characteristics and structures are common to echinoderms?
One of the most striking characteristics of echinoderms is the presence of a complex system of blades, channels and valves, called the aquifer or ambulacrarium system (from the Latin ambulare: to walk). This system is related to locomotion, breathing, circulation, excretion and even the animal’s perception.
What is the characteristic that brings echinoderms closer to chordates?
In addition to the endoskeleton of mesodermal origin, several other characteristics bring the phylum of echinoderms closer to chordates . This set of characteristics places these two phyla in the same group: the deuterostomes group.
What is the similarity between echinoderms and chordates?
The similarity between echinoderms and chordates , that is, vertebrate animals, is the existence of a notochord, that is, a nervous system that is protected, they also have a closed circulatory system for gas exchange,… Echinoderms are animals that inhabit the maritime environment.
What are the main characteristics of a chordate?
The main characteristics of chordates are the presence of a notochord, dorsal nervous system, gill slits and tail at some stage of life. They are triploblastic, coelomate, metamerized and deuterostome. Most have a skeleton and a closed circulatory system, with a ventral heart.
What are the characteristics of the subphylum Vertebrata?
– a developed axial and appendicular endoskeleton, made up of dozens or hundreds of vertebrae fused to the spinal column; – a peculiar cranial morphology; – a muscular system composed of three types of tissues (skeletal striatum, cardiac striatum and smooth tissue);
What are the main characteristics of a chordate? How are chordates classified? Name two characteristics of each Subphylum?
The group of chordates is divided into 3 subphyla : Urochordates, Cephalochordates and Vertebrata. Urochordates: Marine and sessile animals, that is, they do not have the ability to move. Its reproduction occurs sexually and its breathing takes place through siphons. … Vertebrata: They constitute vertebrate animals.
What are the main characteristics that allow us to distinguish a vertebrate?
Characteristics of vertebrate animals Vertebrates’ main characteristics are the spinal cord and the vertebral column, which is made up of vertebrae. … Muscles (skeletal, cardiac and smooth striatum) and the internal skeleton form necessary structures for animals to adapt to the way of life they lead.
What are the main characteristics of fish?
Fish are found in the most varied aquatic environments and are characterized by being the most numerous and diverse group of vertebrates. In this group of animals, we have representatives with a typically fusiform body; breathing, generally of the gill type; presence of fins; and ectothermy.
What does an animal need to have to be considered a vertebrate?
All vertebrates have a head and skull surrounding the brain, which is made up of the forebrain, midbrain and hindbrain. They also have, in the embryonic phase, the neural crest – forming structures such as the cephalic crest. It is these peculiarities that differentiate them from all other living organisms.
What are the 5 types of vertebrate animals?
Vertebrate animals are those that have bones, forming the spine and skeleton. This structure helps protect the organs and allows these animals to be larger. They are divided into five groups: fish, reptiles, amphibians, birds and mammals.