Evaluate Basic External Animal Anatomy and Morphology - AgriSETA
Evaluate Basic External Animal Anatomy and Morphology - AgriSETA
Evaluate Basic External Animal Anatomy and Morphology - AgriSETA
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<strong>Evaluate</strong> <strong>Basic</strong> <strong>External</strong> <strong>Animal</strong> <strong>Anatomy</strong> <strong>and</strong> <strong>Morphology</strong>Primary Agriculture NQF Level 1 Unit St<strong>and</strong>ard No: 11617339 The footThe muscular foot is flat <strong>and</strong> large <strong>and</strong> makes up a large part of the body. The visceral humpBehind the head of the snail <strong>and</strong> above the muscular foot the visceralhump is situated. The internal organs are held together <strong>and</strong> protected by athin, strong skin called the visceral sac. On one side this skin makes a foldknown as the mantle. The part of the mantle, which projects beyond therim of the shell, is thickened by a great number of gl<strong>and</strong>s <strong>and</strong> is called themantle collar. The gl<strong>and</strong>s in it secrete gel. The breathing pore can be seenon the collar. The skeleton of a snailThe snail has a hydrostatic skeleton: the body iskept firm by water pressure. Large spaces in the bodyare filled with watery liquid <strong>and</strong> the pressure of thisliquid within the body makes the body firm <strong>and</strong>provides a skeleton for the muscles to work against. Breathing pore in the collarThe snail breathes through its mantle. The cavity between the mantle <strong>and</strong>the visceral sac is called the mantle cavity <strong>and</strong> it is connected to theoutside atmosphere by the breathing pore in the collar. Gaseous exchangeoccurs between the air in the mantle cavity <strong>and</strong> the blood in the mantle. Lifecycle of snailsThey lay eggs in damp soil that are later hatched. The small snails developto adult snails in South-Africa in approximately 10 months <strong>and</strong> in otherparts like California in America in up to 12 months.My Notes …. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Version: 01 Version Date: July 2006