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It contracts slowly but maintains contractibility over a wide range of stretch lengths.
It is found in such organs as sea anemone tentacles and the body wall of sea cucumbers.
The dermis is covered with separate dermal placoid scales.Cardiac muscle is found only in the heart, allowing it to contract and pump blood round the body.Sharks and rays are basal fish with numerous primitive anatomical features similar to those of ancient fish, including skeletons composed of cartilage.Skeletal muscle contracts rapidly but has a limited range of extension.It is found in the movement of appendages and jaws.
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They have a cloaca into which the urinary and genital passages open, but not a swim bladder.