chapter 41 section 2 Flashcards
lateral line system
The lateral line is a system of canals in the skin
that are lined with sensory structures that detect
vibrations in the water.
cartilage
Cartilage is a flexible, lightweight material made of
cells surrounded by tough fibers of protein
placoid scale
A placoid scale is one of many small, toothlike
spines that cover the skin of a cartilaginous fish.
Fishes obtain the oxygen they need by absorbing it through their
gills
The body of a freshwater fish usually
has a higher concentration of solutes than the surrounding water does.
One characteristic of many lampreys but not of hagfishes is
parasitic lifestyle
Fishes in the class Chondrichthyes
have movable jaws
Some cartilaginous fishes store lipids in their liver as an adaptation that
increases bouyancy
Describe the feeding behavior of a hagfish.
A hagfish burrows into the body of a dead or
dying fish or invertebrate and pinches off chunks
of tissue with two movable plates and a rough
tonguelike structure in its mouth.
methods by which shark can locate prey
sense of smell and sight
lateral line system
detects electrical vibrations in the water
Describe two methods by which cartilaginous fishes can cause water to flow across their gills
Cartilaginous fishes can move water over their gills
by swimming with their mouth open and by expanding
and contracting their mouth cavity and pharynx.
Contrast fertilization in lampreys with that in cartilaginous fishes
Fertilization in lampreys occurs outside the body
of either parent, but fertilization in cartilaginous
fishes occurs inside the body of the female
Which type of fishes would you expect to produce more gametes each time
they reproduce—jawless fishes or cartilaginous fishes? Explain your reasoning
Jawless fishes should produce more gametes since
fertilization occurs externally. With external fertilization,
there is a lower chance that sperm and
eggs will meet. Producing more gametes increases
the chances of fertilization.
