A passive biological system that removes excess, unnecessary materials from an organism, so as to help maintain homeostasis within the organism and prevent damage to the body. It is responsible for the elimination of the waste products of metabolism as well as other liquid and gaseous wastes, as urine and as a component of sweat and exhalation. Removes metabolic and liquid toxic wastes as well as excess water from the organism, in the form of urine.
One of the main functions of this is to diffuse gaseous wastes, such as carbon dioxide, from the bloodstream as a normal part of respiration. Kidneys
Its primary function is to eliminate the waste from the bloodstream by prod Ureter
This is the muscular ducts that propel urine from the kidneys to the urinary bladder. In the human adult, the ureters are usually 25-30 cm (10-12 in) long. Urinary bladder
It is the organ that collects urine excreted by the kidneys prior to disposal by urination. It is a hollow muscular and distensible (or elastic) organ, and sits on the pelvic floor. Urine enters the bladder via the ureters and exits via the urethra. Urethra
It’s a tube which connects the urinary bladder to the outside of the body. In humans, the urethra has an excretory function in both genders to pass.
Within the kidney, blood first passes through the afferent artery to the capillary formation called a glomerulus and is collected in the Bowman’s capsule, which filters the blood from its contents—primarily food and wastes. After the filtration process, the blood then returns to collect the food nutrients it needs, while the wastes pass into the collecting duct, to the renal pelvis, and to the ureter, and are then secreted out of the body via the urinary bladder.
Excretion and Body Waste Products
Just as your living body cells need oxygen to burn food for fuel or energy, they must also give off waste products. The blood that brings food and oxygen to your body cells is the same blood that carries away the cellular wastes in the process of excretion.
Excretion is a process by which waste materials from the oxidation of food in cell metabolism are removed from the living cells. Carbohydrate breakdown produces carbon dioxide and water as its waste products. Carbon dioxide and water as its waste products. Carbon dioxide is removed from the body through the lungs during expiration.
Protein metabolism involves waste products, too. These result from the separation of the carbon and nitrogen parts of amino acids before oxidation of the carbon part. Other waste products include urea and uric acid.
Urea is a nitrogenous waste substance found chiefly in the urine of mammals. It is formed in the liver from proteins that were broken down. Uric acid, another nitrogenous waste product of cell activity, is water-insoluble and is mainly found among humans, some mammals, and land animals like insects, birds, and reptiles. The Kidney as Main Excretory Organs
Blood cleansing is therefore very important to life. Your kidneys are your body’s high-speed cleansing organs. How do they work?
Suppose you had a gallon of sandy water. You want to get the clear water and leave the sand behind. What would you do? If you pass the water through a muslin cloth or an old t-shirt, you will be able to collect clear water; the sand will be strained and collected by the cloth. Filtering
* A process of removing dirt.
In that case, you filtered sand from water.
The Location of the Kidneys inside Your Body
Deep layers of fat surround, cover, and protect your kidneys. A frontal section of one kidney will reveal several regions and structures Cortex
- Outermost region
- Inner two-third region containing conical protections called pyramids. Pelvis
- Saclike cavity where the points of the pyramids extend to where urine is secreted Renal Artery
- Branching from the aorta and carrying the blood into the kidney Nephrons