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Comaprision Between the Excretory Systems of Human and Fishes
Transcript of Comaprision Between the Excretory Systems of Human and Fishes
and Fishes What is an Excretory System? The excretory system is a passive biological system that removes excess, unnecessary or dangerous materials from an organism Human Excretory System This is a visual explaination of the system that
is being talked about As we all have learnt, the excretory system of all animals, including humans,removes waste but, the question is 'how'? How does the excretion happen? The answer to that are three words:" by excretory organs". 1 2 3 4 5 6 7 8 9 Organ Kidneys The kidneys are organs with several functions.
They serve the body as a natural filter of the blood, and remove wastes from the blood. The wastes can be unwanted water, minerals and urea. The kidneys play
a very important role in
the excretory system! (s) Renal Vein Renal veins are blood vessels that carry deoxygenated blood out of the kidney to the inferior vena cava.
One large blood vessel that branches off from the abdominal aorta and enters into the kidney. Blood is carried inside the renal artery. Liver Vital part of the excretory system;it helps get rid of unneeded wastes in the body.
It changes toxic ammonia, which is a poisonous gas , to urea, a harmless fluid. Aorta The large trunk artery that carries blood from the left ventricle of the heart to branch arteries. (Carries blood from the left ventricle of the heart to the renal artery). Vena Cava A large vein that returns blood to the heart from all of the organs below the diaphragm. Ureter Either of a pair of thick-walled tubes that carry urine from the kidney to the urinary bladder Urinary Bladder The urinary bladder is the organ that collects urine excreted by the kidneys before disposal by urination. Urethra The tube through which urine exits. Nephron Parts of the kidney that remove waste products from the blood, recover some substances to be used again by the body. Saltwater Fish Excretory System The Excretory system of a Human.. Two Main Organs Kidneys Gills
Like all vertebrates, fish have a pair of kidneys. One of the main functions of the kidney is to regulate excretion and water levels in the body. It acts like a balancing device, making sure that the body has the right ratio of water to salt and other chemicals. The kidneys also produce nitrogenous waste, which in turn is excreted through fish urine. Excreted Substances In mammals nitrogenous waste is excreted as urea, the chief ingredient in urine, in saltwater fish much nitrogenous waste takes the form of ammonia. Ammonia is more poisonous than urea. However, any ammonia excreted by the fish is quickly diluted by the surrounding seawater. This is why fish kept in tanks are at risk of suffocating unless the water is changed or refreshed.
Most of the nitrogenous waste excreted by saltwater fish is through the gills ;primarily ammonia. The gills also contain cells that allow the release of sodium and chloride; in other words, salt. However, while a fish's gills excrete ammonia, CO2 and salt, the gills also allow the loss of a lot of water. Thus the fish has to intake salt water continuously. To fish, drinking and "breathing" are effectively the same thing, as they obtain their oxygen by drinking in water past the gills. Comparision Between the Two Humans Fishes ammoniotelic ureotelic have gills to help excrete Kidneys are the primary organs
Have a liver, an aorta, kidneys, ureters, urinary bladder, and nephrons Have a different name for the Urinary orifice Have different name for the Urethra Kidneys are shaped like beans Have a pair of kidneys and ureters Kidneys are shaped like long tubes Kidneys are located near the back / This was the comparison of the excretory systems of humans and saltwater fishes. The process begins as blood is carried in the aorta to our kidney and is entered inside by our renal artery. This artery divides up into many arterioles.These arterioles go to the Bowman's Capsules of nephrons, where the wastes are taken out of the blood by pressure filtration.Peritubular capillaries also surround the nephron so substances can be taken in and out of the blood.The renal pelvis takes urine away from the kidney through the ureter.Both of the ureters lead the urine into the body's only urinary bladder, which expands and sends nerve impulses when full.From there, urine is expelled through the urethra and out of the body. (The vena cava performs it's role when it carries oxygen-depleted blood back to the heart).
81 These two were the main organs but, not the only ones. Fish also have the organs listed below.
Fish liver = Human liver
Fish kidney = Human kidney
Fish ureter = Human ureter
Fish Urinary Bladder = Human Urinary Bladder
Fish Urinary Orifice = Human Urethra
Fish Dorsal Aorta = Human Aorta
Fish Nephrons= Human Nephrons
Fish Gills = --- Don't have renal veins or arteries Have renal veins and arteries
Saltwater fish urinate much like humans do; their excretory system is remarkably similar to that of humans and well-adapted to life in the salty water of the ocean.
The saltwater fish's major excretory waste products are excess sea salt and nitrogenous compounds.
Because of their habitat, saltwater fish take in a lot of salt with their food and by constantly drinking salty water.If saltwater fish didn't excrete this salt they would risk losing much of their body water by osmosis through the skin and gills.
Saltwater fish are efficient at removing salt ions from their body, partly by creating small amounts of highly concentrated urine containing very little water.