BZ 110 Lecture Notes - Lecture 7: Creatinine, Ovoviviparity, Pylorus
Document Summary
Skull surrounds brain, olfactory organs, eyes, and inner ear. Most are predators as adults filter feeders as larvae. Life cycles involve open water adult stages and stream or river larval stages. Streamlined shape mucoid secretions, buoyancy of water, body wall muscles, fin shape all promote efficient locomotion. Specializations include sporal valve (sharks) and pyloric cecae (bony fishes) Blood passes thru the heart once with every circuit around the body. Opercular and pharygeal muscles pump water in most fishes. Ram ventilation in elasmobranchs and open ocean bony fish. Pneumatic sacs (gas chambers) connect to digestive tract. Function as swim bladders in together bony fish. Blood secretes gases into swim bladder thru the gas gland and gases are reabsorbed into the blood at the ovale. Sharks store urea in tissues al over the body. Some ovoviviparous (some sharks) or viviparous (other sharks)
