BIOL110 Lecture Notes - Lecture 6: Prostomium, Clitellum, Clitellata
9 Dec 2016
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Document Summary
Food in the mouth, together with pharynx and prostomium. No discrete organ for respiration, breathe through skin (passive diffusion of gases), need to remain moist, even if it rains. Circulatory system present to allow gas exchange through body. Have hemoglobin to move oxygen from outer wall to interior tissues. Excretion, discrete specific organ for these animals to excrete. Allow metabolic waste to be concentrated in tubules and water to be pushed outwards. As it goes through nephridia, there will be a pore that drains through outside world. Constantly removing waste through these pores (nephridiopore) Leaves the safety of the burrow to mate. Hermaphrodites: one individual can produce male and female gametes. Two worms have to find each other, clitellum is present and produces mucus to stick two worms together in opposite orientations. By the end, eggs are layed into soil, small worms that look like adult worms are hatching out of the eggs.
