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Functions Of Shark Structures

Functions Of Shark Structures
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Side ASide B
protection of the skin
placoid scales
controlling the sharks direction as it swims
Fins (except caudal)
Propelling the shark
tail and caudal fin
grsping prey and cutting off pieces of meat, but not chewing
teeth
discharges water that has come in through the mouth and passed over the gills
external gill slits
swallowing and also passing incoming water to gills
pharynx
heavily vascularized, feathery fans of tissue that take oxygen from the water passing over...
gills
allowing water to enter the mouth of the shark when it is holding food in its jaw
spiracle
canals from top of head to inner ear (possibly a role in equillibrium)
endolymphatic pores
sample of water for odors
external nares
sensing minute electrical fields given off by prey
ampullae of lorenzini
sensing tiny pressure disturbances in the water, such as those made by swimming prey
lateral line system
outlet for feces, urine, and reproductive products
cloaca
dischares urine and sperm into the cloaca in the male
urogenital papilla
discharges urine into the cloaca in the female
urinary papilla
unknown by may equalize pressures in the body cavity and external environment or outlet excess...
abdominal pores
introduction of sperm into female's cloaca.
claspers
carries sperm on the claspers
doral grooves
body cavity caudal to the transverse septum; holds all abdominal organs
pleuroperitoneal cavity
body cavity cranial to the transverse septum
pericardial cavity
sheet of tissue separating the pleuroperitoneal and pericardial cavities
transverse septum
loose connective tissue convered with squamous epithelium, covers the organs
visceral peritoneum
sheets of peritoneum that attach organs to the body wall
mesentery
holds the oil that gives the shark buoyancy, many digestive functions such as storing nutrients...
liver
storing bile, a liquid that breaks up fat droplets in the gut
gall bladder
passing food from the pharynx to the stomach
esophagus
storing of meals until digestion can begin
stomach
initial digestion of food
stomach
allowing the stomach to expand as food is taken in
rugae
a muscular, narrow portion of stomach that controls entry of food from the stomach into the...
pylorus
secretion of many digestive enzymes
pancreas
blood reservoir, immune functions
spleen
the portion of the small intenstine just beyond the pylorus; many digestive secretions are...
duodenum
largest middle portion of the intestive; digestion and nutrient absorption
ileum
narrow portion of the intestive cranial to the rectal gland; formation of feces
colon
portion of intestine caudal to the rectal gland; elimination of feces
rectum
slowing the progess of food through the ileum; increasing internal surface area of ileum
spiral valve
removes excess salts from the sharks circulation
rectal gland
salt and water balance, eliminating toxic wastes
kidneys
carries urine in both sexes and sperm in males
opisthonephric duct
making sperm
testes
mestentary attaching ovaries to the body wall
mesorchium
storage of sperm and passing of sperm to the sperm sacs
seminal vesicles
a space formed by the union of the two sperm sacs in the male
urogenital sinus
making eggs
ovaries
where are eggs released?
into the coelom
takes in immature eggs from the coelom and passes them to the oviducts
ostium tubae
secreats a membranous shell around groups of eggs and also serves a reservoir for sperm from...
shell gland
passes the eggs from the ostium tubae to the uterus
oviduct
stores and nutures the developing embryo
uterus
covers the heart
pericardial membrane
filled with fluid that reduces friction between the beating heart and surrounding structures
pericardial cavity
receives blood from the body and passes it to the atrium
sinus venosus
pumps blood into the ventricle
atrium
the most muscular portion of the heart; pumps blood into the bentral aorta through the gills...
ventricle
conducts blood from the ventricle to the ventral aorta
conus asteriosus
conduct blood from the ventral aorta to the gills
afferent branchial arteries
conduct blood from the gills to the dorsal aorta
efferent branchial arteries
carries oxygenated blood from the gills to the body
dorsal aorta
lead from the pharynx to the gill chambers
internal gill slits
a cartilage skeletal element that supports the gills
gill arch
protect the gills from food in the sharks mouth
gill rakers
unknown but perhaps preventing swallowed food particles from coming up the espophagus
esophageal papillae
not fully known but probably muscular coordination
cerebellum
processin of visual data
optic lobes
not fully known but probably control of simple relexes like blood pressure, heart rate, etc
medulla
not fully known but probably processing sensory information and sending signals to the muscles
cerebrum
processing of chemical stimuli in the water
olfactory lobes


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