Spleen: A shark’s spleen’s purpose is to create red blood cells. In humans, red blood cells are created in bone marrow, however, sharks have no bones or bone marrow. A shark’s spleen is the main part of its immune system.
Where is the spleen in a dogfish shark?
The dark, triangular-shaped spleen is located near the posterior end of the stomach. Although a part the Iymphatic system, the spleen is closely associated with the digestive organs in all vertebrates. The valvular intestine is the second, and much larger, portion of the small intestine.
What is the function of the kidneys in a dogfish shark?
—For adaptation to high- salinity marine environments, cartilaginous fishes (sharks, skates, rays, and chi- maeras) adopt a unique urea-based osmoregulation strategy. Their kidneys reabsorb nearly all filtered urea from the primary urine, and this is an essential component of urea retention in their body fluid.
What is the function of the spleen?
It controls the level of blood cells. The spleen controls the level of white blood cells, red blood cells and platelets (small cells that form blood clots) It screens the blood and removes any old or damaged red blood cells.
What organ removes salt from the sharks body?
The first is the spleen, which is a dark organ near the stomach that belongs to the lymphatic system. The second is the rectal gland, a small organ that opens by a duct into the rectum. It acts as a salt gland, removing excess sodium chloride (salt) from the blood.
Do sharks have spleens?
Spleen: A shark’s spleen’s purpose is to create red blood cells. In humans, red blood cells are created in bone marrow, however, sharks have no bones or bone marrow. A shark’s spleen is the main part of its immune system.
How do dogfish urinate?
Without a bladder, dogfish basically urinate through their skin by osmosis. Once dogfish die, bacteria can quickly convert the urea in their blood and tissue into ammonia.
What is the function of the pancreas in a shark?
The pancreas is both an exocrine gland, producing digestive enzymes and an endocrine gland regulating metabolism.
What happens without a spleen?
Life without a spleen
You can be active without a spleen, but you’re at increased risk of becoming sick or getting serious infections. This risk is highest shortly after surgery. People without a spleen may also have a harder time recovering from an illness or injury.
Which is not a function of the spleen?
Answer and Explanation: The spleen does not (b) produce new erythrocytes in adults. Erythrocytes are produced by bone marrow cells. The process by which red blood cells are produced is known as erythropoiesis.
Which animal has the spleen in its feet?
This is Expert Verified Answer
Answer : Animal having spleen in it’s feet is Pig. All animals possessing vertebral column has spleen in their body except two organisms which are Hagfish and Lampreys.
What features of a shark’s anatomy allow it to survive in the ocean?
Shark skeletons are made of cartilage. This is strong and durable, yet much more flexible and lighter than bone. Being lighter helps a shark to stay afloat and reduces the amount of energy they need to move about. The flexibility of cartilage also allows them to make tight turns quickly.
What excretes excess salts and water?
The kidneys are the part of our excretory system. It plays an important role by filtering blood and removing urea, excess salt and water from the body as urine.
How do sharks regulate salinity?
Sharks cope with the salty water by generating lots of the chemical urea. This substance, produced throughout the shark’s body, counterbalances the salt in the ocean water. In other words, there’s as much salt in the seawater as there is urea (and other chemicals) in the water inside the shark’s tissues.
How do dogfish sharks digest food?
The increased surface area of the intestines increases the food’s transit time through the intestines, which increases the amount that can be absorbed. The spiral valve allows the food to be completely absorbed and digested. The more food that can be absorbed, the less a shark has to eat.
What color is shark blood?
From timber wolves to tiger sharks, most vertebrate animals have crimson blood in their veins. This hue is produced by hemoglobin, the protein that helps our blood distribute oxygen.
What is the thing on top of a shark called?
Dorsal fins are the ones that most people are familiar with; these fins are often seen when a shark is at the water’s surface. Oftentimes, sharks have a first and second dorsal fin. These fins are also used for stability during swimming.
Is dogfish poisonous?
Meet the Pacific spiny dogfish
As their name suggests, spiny dogfish sharks sport sharp, venomous (poisonous) spines in front of each dorsal fin.
Can u eat dogfish?
You can eat dogfish without a problem. Dogfish are edible and are regarded by some as one of the tastiest sea foods out there. If someone was to ask me what dogfish tastes like, I would tell them that smooth dogfish in particular have a flaky, firm texture, with a mild sweet flavor.
Are dogfish poisonous to humans?
Using sharp, venomous spines in the front of each dorsal fin, the spiny dogfish is a small but mighty predator that isn’t afraid to take a jab at passing fish. They are considered one of the most abundant living shark species in the ocean, but are harmless to humans.
What is the largest organ in the shark?
Shark livers are huge, consisting of two large lobes surrounding the digestive tract. In some sharks the liver comprises up to 30% of their body weight.