sharks p 3-8
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how do sharks swim
powerful sideways sweeps of the caudal fin
heterocercal
dorsal side of the fin is longer than the ventral side
what kid of tail do thresher sharks have and how do they use it
heterocercal - used to herd and stun prey
paired pectoral fins used for
steering and balance
what do pelvic fins of male sharks have and what is it used for
claspers - to transfer sperm during reproduction
what secretes a substance to help with buoyancy and what is it called
the liver - squalene
squalene
oily material less dense than water
what is the vertibral colomn made of
made of small disks strung together
how do you tell a sharks age
by cutting open the vertebrae and counting the rings
where Chrondroitin found in
found in sharks cartilage - said to ease the symptoms of arthritis
nictitating membrane
reduces brightness and protects the eyes
what is smell used for
to find prey or finding a mate
which shark has the best sense of smell
great white sharks
what do neuromasts detect
detects vibration - the slightest movement and shark will know
ampullae of lorenzi
sensory organ used to detect electrical current - located on the snout and the sides of the head
what do sharks mistake humans as
injured seals
what are gills made of
gill filaments
how many heart chambers to sharks have
2 chambers
what shark can rest on the bottom of the ocean and still be able breathe
nurse shark
how do shark teeth grow
continuously like a conveyor belt
how many teeth do sharks lose in a lifetime
30,000
spiral valve
slows down the movement of food to increase the absorption of nutrients
how much of the body does the liver take up
25 percent
what does the liver do
filters out the toxins and stores vitamins for future use - also prolongs feeding times in sharks