BIOB34H3 Lecture Notes - Lecture 4: Local Anesthetic, Whiskers, Amebocyte
Document Summary
A nutrient is a substance that: serves as a source of metabolic energy, serves as raw material for growth, tissue maintenance and exported. Animal nutrients include lipids, carbohydrates, proteins, vitamins, and organic matter minerals. Essential nutrient is one that an animal cannot synthesize de novo in adequate quantities to meet its needs; therefore, it must be obtained from its diet. Feeding is the process of obtaining nutrients; feeding behaviour is modulated to meet the specific nutrient needs of the individual. Passive absorption through the body wall: ex. Parasitic barnacles (secondarily gutless: live within host, surrounded by nutrient rich fluid, attaches to host, uses hosts energy on self, through host"s body wall. Sponges (single opening: water enters via porocytes exits via osculum, choanocyte is the feeding cell, amoebocyte is digestion cell, ex. Tunicates (two openings: oral siphon and atrial siphon, pharynx has slits which filter food, ex. Weaving spiderlings: use webs, as filter and fluid is air catch pollen and insects.
