Urea and urine are made in kidney and excreted out through excretory system. is the statement true or false?

Kidneys are the main organ of the human excretory system. Also, every individual has a pair of kidneys. They are located one on each side of the spine at the level of the liver. Kidneys are divided into three regions. Namely, the renal cortex which is the outer layer. Next, the renal medulla which is the inner layer. And lastly, the renal pelvis which carries the urine from the kidney to the ureter. Browse More Topics • Introduction to Excretion in Plants • Urine Formation • Regulation of Excretion • Micturation • Disorders of the Excretory System Structure of a Nephron The nephron is the functional unit of a kidney. In fact, each kidney consists of millions of nephrons. They all function together to filter blood and expel waste products. It consists of the following parts: • Bowman’s capsule– It is the first part of the nephron. It is a cup-shaped structure and receives the blood vessels. Glomerular filtration occurs here. The blood cells and proteins remain in the blood. • Proximal Convoluted Tubule– The Bowman’s capsule extends downwards to form the proximal tubule. Water and reusable materials from the blood are now reabsorbed back into it. • The loop of Henle– The proximal tubule leads to the formation of a u-shaped loop called the Loop of Henle. It has three parts: the descending limb, the u-shaped bend, and the ascending limb. It is in this area in which urine becomes concentrated as water is reabsorbed . The descending limb is permeable to water whereas the ascendi...

Term Meaning Digestive system The body system that converts food into energy and nutrients to fuel the body Chemical digestion The breaking down of food using chemical agents, such as enzymes and bile Mechanical digestion The breaking down of food by physical means, such as chewing Absorption The process by which nutrients pass through the walls of the digestive system into the blood Excretory system The body system that removes metabolic wastes from the body Excretion The process of removing wastes and excess water from the body The chyme is slowly transported into the small intestine, where most chemical digestion takes place. Bile, which is made in the liver, is released from the gallbladder to help digest fats. In addition, enzymes from the pancreas and intestinal walls combine with the chyme to start the final part of digestion. The chyme then enters the large intestine. Here, water is removed and bacteria break down some undigestible materials, producing important compounds (such as vitamin K). The concentrated waste material that remains is called feces, which is passed into the rectum and eliminated from the body through the anus. The small intestine is actually longer than the large intestine. In fact, at approximately 20 feet in length, the small intestine is nearly four times as long as the large intestine (5 feet long)! However, the intestines are named for their diameters, not their lengths. The large intestine has a diameter of about 3 inches compared to the ...

Direct evidence for the occurrence of filtration at the glomerulus was first provided by experiments on the amphibian When an amphibian leaves the water, a number of physiological adjustments are made that have the effect of conserving water. The rate of glomerular filtration is reduced by restriction of the blood supply, and this together with an increased release of antidiuretic hormone results in the production of a small volume of urine of the same concentration as the blood. Antidiuretic hormone (ADH, also known as The By contrast, the In Osmotic and ionic regulation in fishes is under hormonal control. This has been studied particularly in fishes such as eels and salmon, which are able to move between fresh water and seawater.

Maintaining water balance in the body Kidneys The kidneys are organs of the urinary system - which remove excess water, salts and urea. The urinary system Blood is transported to the kidney through the renal artery. The blood is filtered at a high pressure and the kidney selectively reabsorbs any useful materials such as glucose, salt ions and water. After it has been purified, the blood returns to the circulatory system through the renal vein. The kidneys produce urine and this helps maintain water balance. The urine is taken from the kidneys to the bladder by the ureters. The bladder stores the urine until it is convenient to expel it from the body. Note that 'ureter' differs from the word 'urethra' . The ureters are tubes that carry urine from the kidneys to the bladder, whereas the urethra is the tube that carries urine out of the body. Urine Urine contains water, urea and salts. Urea is produced in the liver when excess amino acids are broken down. Urea is the main waste product removed in the urine, as it is not reabsorbed in the kidney. The nephron The role of the kidney Each kidney contains over one million microscopic filtering units called nephrons. Each nephron is made of a tubule and is responsible for 'cleaning' the blood by removing urea and excess water and mineral ions. The kidney works in a number of different stages: Stage 1 - Filtration Blood passes through the nephron inside the kidneys, there are many capillaries inside the kidney, and the blood is und...