sharks p 3-8 Flashcards

1
Q

how do sharks swim

A

powerful sideways sweeps of the caudal fin

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2
Q

heterocercal

A

dorsal side of the fin is longer than the ventral side

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3
Q

what kid of tail do thresher sharks have and how do they use it

A

heterocercal - used to herd and stun prey

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4
Q

paired pectoral fins used for

A

steering and balance

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5
Q

what do pelvic fins of male sharks have and what is it used for

A

claspers - to transfer sperm during reproduction

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6
Q

what secretes a substance to help with buoyancy and what is it called

A

the liver - squalene

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7
Q

squalene

A

oily material less dense than water

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8
Q

what is the vertibral colomn made of

A

made of small disks strung together

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9
Q

how do you tell a sharks age

A

by cutting open the vertebrae and counting the rings

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10
Q

where Chrondroitin found in

A

found in sharks cartilage - said to ease the symptoms of arthritis

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11
Q

nictitating membrane

A

reduces brightness and protects the eyes

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12
Q

what is smell used for

A

to find prey or finding a mate

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13
Q

which shark has the best sense of smell

A

great white sharks

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14
Q

what do neuromasts detect

A

detects vibration - the slightest movement and shark will know

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15
Q

ampullae of lorenzi

A

sensory organ used to detect electrical current - located on the snout and the sides of the head

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16
Q

what do sharks mistake humans as

A

injured seals

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17
Q

what are gills made of

A

gill filaments

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18
Q

how many heart chambers to sharks have

A

2 chambers

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19
Q

what shark can rest on the bottom of the ocean and still be able breathe

A

nurse shark

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20
Q

how do shark teeth grow

A

continuously like a conveyor belt

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21
Q

how many teeth do sharks lose in a lifetime

A

30,000

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22
Q

spiral valve

A

slows down the movement of food to increase the absorption of nutrients

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23
Q

how much of the body does the liver take up

A

25 percent

24
Q

what does the liver do

A

filters out the toxins and stores vitamins for future use - also prolongs feeding times in sharks

25
what do they need to maintain so they dont die
solute concentration - they will lose water by osmosis and die
26
how do they retain nitrogenous waste
retain urea and tmao
27
what is used to remove excess salts from the body
kidneys, rectal glands, gills
28
what shark can remove all nitrogenous wastes from its body
bull shark - can also enter freshwater systems
29
cloaca
connects the genital and urinary ducts
30
where does fertilization occur
internally
31
how do males transfer sperm to females
claspers
32
oviparity
primitive more of production
33
eggs laid outside of the body
oviparity
34
mermaid purses
oviparity
35
spotted dogfish and bamboo sharks reproduce this way
oviparity
36
most common mode of reproduction
ovoviviparity
37
eggs develop and hatch inside of mothers stomach nourished by yolk inside
ovoviviparity
38
basking shark, thresher shark, and saw shark reproduce this way
ovoviviparity
39
most advanced mode of reproduction
viviparity
40
young attached directly to the mothers uterus
viviparity
41
uterus produces uterine milk
viviparity
42
when an embryo is made without sperm fertilization
parthenogenesis
43
similar to humans
eyes
44
parthenogenesis has only been seen in
hammerhead females
45
what can be transplanted into humans
corneas
46
what is the cartilage used for
cancer research and arthritis aliments
47
what is the liver used for
vitamins, lubricants, and cosmetics
48
what is abundant iin sharks and used to treat night blindness
vitamin a
49
what is tiger sharks skin used to make
shagreen
50
what is finning
cutting off the sharks fins and throwing them back into the ocean
51
what keeps sharks from repopulating quickly
slow reproductive cycle
52
what do sharks stop from over populating
groupers
53
what is breaching
when sharks jump out the water and make a huge splash
54
what can breaching be used for
cleaning the body of parasites and attracting a mate
55
why do males bite females
to mate
56
shark breeding age
6-14 years
57
how long is the gestation period
a little longer than 1 year