Gall bladder: stores bile produced by the liver before it is delivered to the duodenum via the bile duct.
Does a dogfish have a gallbladder?
The rectal gland is for salt excretion for osmoregulation. The rectum, the most posterior portion, ends in the anus which projects into the cloaca, a common opening with the urogenital ducts. Liver, composed of three lobes, and a greenish gall bladder. These extend posteriorly from the transverse septum.
What sensory organs do dogfish sharks have?
eyes, snout, and nostrils are the openings of the ampullae of Lorenzini. These sense organs are sensitive to changes in temperature, water pressure, electrical fields, and salinity. organs called claspers on the inner side of their pelvic fins. Fertilization in the dogfish shark is internal.
What structure is unique to dogfish?
A feature peculiar to our specimen, the spiny dogfish, is the presence of two spines, one immediately anterior to each dorsal fin. When captured, these sharks will arch their backs and attempt to pierce their captor with these long sharp spines.
Does dogfish have swim bladder?
Chondrichthyeans lack the swim bladder or lung that evolved early among the bony fishes, and modern sharks all possess a large, oil-filled liver that dramatically reduces their specific density.
Do sharks have a gallbladder?
The large liver is not lobed but weakly scalloped posteriorly. The gall bladder is on the liver near the duodenum. The hepatic ducts and bile duct empties into the duodenum as in the shark, but may be difficult to see.
What is the largest organ in the shark?
Liver
Liver: Taking up roughly 80% of the shark’s internal body cavity, the liver is the largest of sharks’ organs. The liver stores energy as dense oil which helps the shark with buoyancy, its ability to float.
What does the bile duct do in a shark?
Bile duct: carries bile from the liver to the duodenum.
What common feature is absent in the dogfish shark?
There is no notch on the upper caudal lobe and the lower caudal lobe is not well-developed. There is no anal fin on the spiny dogfish.
Is dogfish poisonous?
But unlike most sharks, dogfish are also venomous. They have two spines, one in front of each dorsal fin, that secrete a mild venom. These sharp spines serve as a defense mechanism against the dogfish’s predators, such as sixgill sharks and seals.
Where are ovaries located in dogfish?
The ovaries are two cream-colored elongated organs in the anterior part of the body cavity dorsal to the liver on either side of the mid-dorsal line. The shape of the ovaries will vary depending upon the maturity of the specimen. In immature females they will be undifferentiated and glandular in appearance.
Can sharks drown?
Is it possible for a shark to drown? Despite being ocean dwellers, most sharks need oxygen to breathe. They don’t have lungs but instead absorb oxygen from the water using their gills. If there’s not enough oxygen available in the water, sharks can’t breathe and can easily drown.
Which organ helps sharks to float?
liver
Sharks mainly rely on their large oil-filled liver to stay buoyant in the oceans. This is one of many ways that sharks are able to remain buoyant in the water without a swim bladder. What are other ways do you think a shark’s body helps with buoyancy.
Do sharks really smell blood?
Sharks can smell blood from hundreds of meters away—in concentrations as low as one part per million (ppm). one cent in 10,000 dollars.
What are gall bladders?
Your gallbladder is a small, pear-shaped organ on the right side of your abdomen, just beneath your liver. The gallbladder holds a digestive fluid called bile that’s released into your small intestine.
Do sharks have 2 Hearts?
Sharks possess a single-circuit circulatory system centered around a two-chambered heart. Blood flows from the heart to the gills where it is oxygenated.
How do sharks digest their food?
Shark intestines are short and compact. The surface area of the intestine is increased by internal valves, or coils, that can take any of several forms. The increased surface area slows food passage through the intestine, and speeds up the rate at which it can be digested and absorbed into the blood.
Do sharks poop?
So, the answer to “do sharks poop” is definitely, yes!
But, sharks possess fairly straightforward digestive systems meaning that, like other fishes, they too poop.
Do sharks have hearts?
A shark’s heart is a two-chambered S-shaped tube, small in proportion to body size. Blood flows from the heart to the gills and then to body tissues.
Do sharks have blood?
Shark blood consists of cells and plasma, a protein, water and a mineral-containing substance. Anderson and his team say that sharks in low salt or freshwater environments have much higher blood volumes than sharks in salty water.
Why dogfish is called dogfish?
The name “dogfish” stems from their habit of feeding in packs — sometimes numbering in the hundreds or thousands. Gathered together, they sweep an area, eating the fishes in front of them. They’ll eat almost anything they can get their strong jaws and teeth on.
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