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Do bivalves have tube feet?
They are used to pass food to the oral mouth at the center, and can attach to surfaces. Tube feet allow these animals to stick to the ocean floor and move slowly. Tube feet are used by starfish are used to open up bivalve shells. The shells of brachiopods and bivalves are held together by strong muscles.
What are the different parts of a bivalve?
The bivalve shell is composed of two calcareous valves. The mantle, a thin membrane surrounding the body, secretes the shell valves, ligament, and hinge teeth. The mantle lobes secrete the valves, and the mantle crest creates the other parts.
How do bivalves use their muscular foot?
Bivalves have a muscular foot, which in many species such as clams, is used to anchor their body to a surface or dig down into the sand.
What is the significance of the tube feet?
Tube feet function in locomotion, feeding, and respiration. The tube feet in a starfish are arranged in grooves along the arms. They operate through hydraulic pressure. They are used to pass food to the oral mouth at the center, and can attach to surfaces.
What is the function of tube feet in echinoderms?
In ophiuroids the tube feet are used to gain a hold on a surface and to pass food to the mouth.
How do bivalve shells grow?
Bivalve shells grow by adding new material (calcium carbonate) to the edges. This leaves a pattern of fine lines (growth lines) on the exterior, that give a history of growth (much like tree rings on the inside of a tree). On the inside, the shell has a set of interlocking pegs (teeth) and sockets that form the hinge.
Why are bivalves useful environmental indicator organisms?
Measurements on bivalves are reasonable indicator candidates because bivalves contribute significantly in these critical ecological areas. Water filtration for feeding is requisite for metabolic activity, and also generates nutrient cycling that stimulates primary production (vigor).
How does the bivalve foot move?
Bivalve foot movement is accomplished through a combination of changing blood pressures and muscle action. Attached to the shell, just below the anterior adductor muscle is a pair of protractor muscles that extend from each side of the foot and attach to the opposite valve. Blood engorges the foot,…
What is the general classification of bivalves based on?
Internal features The general classification of the bivalves is typically based on shell structure and hinge and ligament organization. The internal anatomy is also a tool in classification, particularly the organs of the mantle cavity, the pattern of water movement through it, and the structure and functioning of the ctenidia and labial palps.
What does it mean to bivalve a cast?
What does it mean to Bivalve a cast? Bivalved cast means the cast cut into two halves. This might be required in cases where frequent inspection in the cast is required, the patient is to be put on a range of motion exercises or a patient. Position the patient.
What is the function of the foot of a mollusk?
…highly muscular organ called the foot, through which muscle fibres run in all directions. The foot of a gastropod is a flat structure used for crawling. Waves of muscular contraction travel along its length, moving the animal slowly over the ground. The foot of a bivalve mollusk is a bulbous…