GENERAL HISTOLOGY

Detailed explanation-1: -When the adductor muscles of a bivalve mollusk contract, the valves close, which compresses the ligament. When the adductor muscles relax again, the elastic resiliency of the ligament reopens the shell .

Detailed explanation-2: -The adductor muscles contain both smooth and striated fibres, enabling sustained (’catch muscle’) and rapid shell closure. The hinge ligament is usually external to the shell, but in many species has shifted to an internal position between the hinge teeth.

Detailed explanation-3: -The muscles are strong enough to close the valves of the shell when they contract, and they are what enable the animal to close its valves tightly when necessary, such as when the bivalve is exposed to the air by low water levels, or when it is attacked by a predator.

Detailed explanation-4: -Bivalves have strong muscles called adductor muscles that attach to the inner side of each valve. The adductors allow them to close the valves very tightly to keep predators out. Some oyster species propel themselves through the water by rapidly opening and closing their valves when escaping from predators.

Detailed explanation-5: -Bivalve mollusks generally have either one or two adductor muscles. The muscles are strong enough to close the valves of the shell when they contract and they enable the animal to close its valves tightly when necessary.