urine
In toads, kidneys filter liquid waste from the blood through a process called ultrafiltration. Blood enters the kidneys, where it passes through specialized structures called nephrons. Within the nephrons, waste products are separated from essential components of the blood, allowing water, salts, and nitrogenous waste to be excreted as urine. This urine is then collected and stored in the bladder until it is expelled from the body.
The most liquid waste excreted by the body is urine, which is produced by the kidneys to filter waste products and excess substances from the blood. Urine is mainly composed of water, electrolytes, and waste products like urea and creatinine.
Kidneys
The main waste excreted by the skin is heat.
The specialized tubes in the kidneys where waste is collected from the blood are called nephrons. Each nephron consists of a glomerulus, where filtration occurs, and a renal tubule, which processes the filtrate to reabsorb necessary substances and secrete waste. This process results in the formation of urine, which is then collected in the renal pelvis before being excreted from the body.
Tom Sigal
Blood cells produce it, then the kidneys or your liver and liver store it in your lower abdomen until it's excreted from your body.
Urea is produced by the liver and is excreted by the kidneys as a part of urine.
Perspiration is the liquid body waste excreted by the sweat glands in the dermis of the skin.
The metabolic waste products of the body are carried to the kidneys by the blood.
The urinary bladder stores liquid waste, as urine, from the kidneys.
The wastes which are collected in the kidney is the toxic nitrogenous waste urea, excess water and excess salts are the main wastes.