Observation on Chordates

Abstract: This laboratory class introduced the external anatomy of the chisel under visual inspection. Introduction: Although a few species of sharks take a chance into fresh piddle on occasion, all sharks be ocean fishes. They be an considerably recognizable group of fish to close people, although their closest evolutionary relatives ar the very different expression skates and rays. The fins of sharks are utilize for stabilizing, steering, lift and propulsion. Each of the fins are utilise in a different manner. There are unmatched or twain fins present along the dorsal midline called the first and befriend dorsal fin. These are anti-roll stabilizing fins. These twain fins may, or may not have spines at their origin. When spines are present they are defensive, and may overly have strip down glands associated with them that produce an plaguy substance. Pectoral fins originate behind the mastermind and extend discoverwards. These fins are used for steer ing during swimming and table service to provide the shark with lift. Pelvic fins are found well(p) the claoca and are also stabilizers. In males they have a subaltern function as they are modified into copulatory organs called claspers. chisels possess the fundamental eye anatomical structure that is found in all vertebrates, scarce with some modification. The shark eye has a reflecting seam called a tapetum lucidum located behind the retina.

Essentially the structure consists of a layer of parallel, plate-like cells filled with silver guanine crystals. The crystals reflect light that has already passed through the retina and redirects it back to restimulate the retina as it passes out through the eye. This in effect ! boosts the visual signal, especially in low light levels grown sharks high visual acuity. Shark skin feels like sandpaper because it has splendid rough platelike scales (also known as dermal denticles). As a result, it is practically dried and... If you want to get a full essay, revise it on our website: OrderEssay.net

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