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Lecture 17

Lecture 17 - Fish.docx

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McGill University
Biology (Sci)
BIOL 111
Suzanne Gray

Lecture 17 - Fish Pharyngeal slits (pouches): Function of pharyngeal slits:  Located on lateral surface of the  Filter feeding (i.e., head cephalochordate and urochordate)  Seem to be an ancestral trait in  Respiration in vertebrates deuterostomes o Water coming in the mouth  Lost in echinoderms passes through slits  In vertebrates, pharyngeal tissue o O a2d CO can2be supported by arches (form a exchanged across a bases for forming an area for gas respiratory surface = gills o Gills located between slits, exchange and turn in jaws) supported by arches Gill slits and Gill arches:  Pharyngeal slits = gill slits  Bars between the slits = gill arches o Bone or cartilage o Gill filaments are on the gill arches o INSERT SLIDE OF JALWESS FISH Bony Fishes:  4 pairs of gill arches  Each arch has 2 pairs of gill filaments  Also have a gill cover (operculum)  Gill rakers: strain the food from going out your gills Respiratory Surfaces: must remain moist, are highly vascularized, are only 1-2 cells thick and have a high surface area Larger surface area and more of them to transfer gases, athletes such as long distance runners have a larger lung capacity. Gill Filament structure:  Thin  Vascularized  High surface area  Blood vessels flow through arches  Capillary beds in gill filaments; gas exchange  Filament epithelium is one cell thick  Water and blood flow in opposing directions  water comes in with high oxygen and meets with the blood which has low oxygen  Lamella: projections off the filament, which provides surface for oxygen transfer  Counter current exchange system: blood and water flow in opposite directions, ensures that concentration gradients are maintained, achieves maximum e
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