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Dogfish Dissection (Morgan, Debralynn, and Brian)
Transcript of Dogfish Dissection (Morgan, Debralynn, and Brian)
By: Debralynn, Morgan, and Brian
The system of nerves and nerve centers in an animal or human, including the brain, spinal cord, nerves, and ganglia.
The liver stores oil, which redcues the shark's density and allows it to swim faster.
The liver of the dogfish is very large and makes up 25% of its total weight.
Food moves through the stomach, to the duodenum, and through the small intestines to the large intestines.
The shark's body takes all of the water from the waste, and then passes the dried out waste through the rectum and out the anus.
The two testes produce the male gametes.
The Vas Deferens carries sperm to the seminal vesicle.
The claspers are external fins which aid in catching a female shark to mate with.
The pancreas helps with the digestion of proteins.
This regulates the chemical composition of body fluids. It removes waste(s) from the body and keeps the right amounts of water, salts, and nutrients.
The rectal gland secretes a fluid that is NaCl with a concentration.
A shark removes waste by diffusing ammonia from the extracellular fluid into the environment. It avoids the buildup of toxic molecules.
All of the waste is filtered and reabsorpted in the rectal gland.
The solute concentration and many nutrient levels are also regulated by the excretory system
The gills are the respiratory organs of the shark. The gills are located in a series of pharyngeal pouches. They are composed of gill lamellae, blood vessels.
The gills provide a blood supply to the arteries that run directly from the nearby heart to the gills. Oxygen diffuses from the ventilating water current flowing over the gills into the blood.
The nervous system controls movements. The brain (the most complicated part of the nervous system) recieves signals from the rest of the body, and uses the information to control the reactions, such as moving the tail.
This is the system of organs and tissues, including the heart, blood, blood vessels, lymph, lymphatic vessels, and lymph glands, involved in circulating blood and lymph through the body.
Ventricle-thick muscular walled cavity that pumps blood through the conus arteriosus to the gills and the body
Atrium- thin-walled with two lateral bulging lobes. It pumps blood to the dorsal ventricle.
The dogfish shark does not have true bone so this means that it is cartilaginous, (It has cartilige instead of bone)
The dogfish's skeleton consists of the skull, and the spine
: Chondrichthyes (cartilaginous fishes)
: Squaliformes Compagno
: Squalidae Blainville
The rectal gland, however, also prevents water loss while still filtering the blood
Cerebral- Part of the brain that deals with intelligence, motor functions, and touch sensation.
Cerebellum- Part of the brain that deals with fine movement coordination, and balance/equilibrium.
Medulla- controls autonomic functions, relays nerve signals between the brain and the spinal chord.
Optic lobe- deals with visual perception, and color recognition.
Most of the muscle in a dogfish is located on the sides of it's body.