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34 Cards in this Set
- Front
- Back
vertebrae
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bones of cartilage that surround the dorsal nerve cord and form the spine
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cranium
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skull that protects the brain
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gill arches
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skeletal elements that support the pharynx.
probably evolved into jaws |
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chemoreception
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ability to detect chemicals in the environment
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barbels
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whiskerlike organs near the mouth
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lateral line
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organ made up of system of canals that senses vibrations in the water
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ampullae of Lorenzini
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sense organs of cartilaginous fishes that detect weak electrical fields
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external fertilization
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fertilization that occurs outside the body of either parent
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cartilage
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flexible, lightweight material made of cells surrounded by tough fibers of protein
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placoid scales
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small, toothlike spines that feel like sandpaper
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gill rakers
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slender projections in the inner surface of shark gills that filter the water
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chimaeras
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ratfishes
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internal fertilization
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fertilization that occurs inside the body (usually female)
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urea
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some cartilaginous fishes convert ammonia into this compound, which is much less toxic
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rectal gland
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removes excess sodium and chloride ions in cartilaginous fishes
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fusiform
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smooth, torpedo shaped body that sharks have
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swim bladder
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gas filled sac used to control buoyancy
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scales
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cover a fish's body. protect it and reduce friction when swimming
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lobe-finned fishes
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fish with fleshy fins supported by a series of bones
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ray-finned fishes
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fish with fins that are supported by long, segmented, flexible rays
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rays
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long, segmented, flexible bony elements that probably evolved from scales
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liver
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located near the stomach, secretes bile
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gallbladder
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stores bile and releases it into the intestine
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pancreas
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releases digestive enzymes into the intestine
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sinus venosus
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chamber that collects deoxygenated blood
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conus arteriosus
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thickened, muscular part of the main artery leaving the heart
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gill filaments
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double row of thin projections on each gill
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countercurrent flow
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arrangement in which water flows across the gill filaments in the direction opposite to blood flow
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cerebrum
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integrates information from other parts of the brain
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operculum
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hard plate that opens at the rear and covers / protects the gills
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optic tectum
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receives and processes information from the fish's visual, auditory, and lateral line divisions
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cerebellum
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part of the brain that helps coordinate muscles, movement, and balance
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medulla oblongata
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part of the brain that controls some body functions & acts as a relay station
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spawning
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fish reproductive behaviors
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