Observation on Chordates

Abstract: This laboratory class introduced the external anatomy of the cheat under visual inspection. Introduction: Although a few species of sharks threaten into fresh piddle on occasion, all sharks be leatherneck fishes. They be an considerably recognizable group of fish to most people, although their closest evolutionary relatives ar the very different flavor skates and rays. The fins of sharks are utilize for stabilizing, steering, lift and propulsion. Each of the fins are use in a different manner. There are ace or twain fins present along the dorsal midplane 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 fell glands associated with them that produce an plaguy substance. Pectoral fins originate behind the passing game and extend break throughwards. These fins are used for steering during swimm ing and garter to provide the shark with lift. Pelvic fins are found get on the claoca and are also stabilizers. In males they have a collateral function as they are modified into copulatory variety meat called claspers. chisels possess the fundamental eye social structure that is found in all vertebrates, scarce with some modification. The shark eye has a theorizeing 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 s! ignal, especially in low light levels grown sharks high visual acuity. Shark skin feels like sandpaper because it has splendid rough two-dimensional scales (also known as dermal denticles). As a result, it is a lot dried and... If you want to get a full essay, revise it on our website: OrderEssay.net

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