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Zoology Ch. 18

Zoology Ch. 18 Vocabulary

TermDefinition
Swim Bladder A gas-filled sac, usually along the dorsal body wall of bony fishes. It is an outgrowth of the digestive tract and regulates the buoyancy of a fish.
Gill Rakers Processes extending from pharyngeal arches of some fishes that trap food and protect gill filaments from mechanical damage.
Ram Ventilation The movement of water across gills as a fish swims through the water with its mouth open.
Gill Arches Bony or cartilaginous gill support of some vertebrates. Also called visceral.
Pharyngeal Lamellae Thin plates of tissue on gill filaments that contain the capillary beds across which gases are exchanged.
Countercurrent Exchange Mechanism The passive exchange of something between fluids moving in opposite directions past each other.
Pneumatic Sacs Gas-Filled sacs that arise from the esophagus, or another part of the digestive tract of fishes. These are used in buoyancy regulation or gas exchange.
Lateral Line System A line of sensory receptors along the side of some fishes and amphibians used to detect water movement.
Electroreception The ability to detect weak electrical fields in the environment.
Nephrons The functional unit of vertebrate kidney, consisting of a renal corpuscle and a renal tubule.
Glomerulus A capillary tuft (coiled mass of capillaries) within the capsule of a nephron.
Cloaca A common opening for excretory, digestive, and reproductive systems.
Operculum The cover of a gill chamber in bony fish.
Gill Filaments A thin-walled, fleshy extension of a gill arch that contains vessels carrying blood to and from gas exchange surfaces.
Created by: rburrier
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