AP BIOLOGY

Detailed explanation-1: -Urine has salts, toxins, and water that need to be filtered out of the blood.

Detailed explanation-2: -The kidneys remove waste products called urea from the blood through tiny filtering units called nephrons.

Detailed explanation-3: -The nephrons of the kidneys process blood and create urine through a process of filtration, reabsorption, and secretion. Urine is about 95% water and 5% waste products. Nitrogenous wastes excreted in urine include urea, creatinine, ammonia, and uric acid.

Detailed explanation-4: -The human body removes waste material like urea and other nitrogenous wastes from the body in the following ways: A kidney is the main excretory organ that filters the blood containing soluble waste material and then eliminates it in the form of urine.

Detailed explanation-5: -Human urine is composed primarily of water (95%). The rest is urea (2%), creatinine (0.1%), uric acid (0.03%), chloride, sodium, potassium, sulphate, ammonium, phosphate and other ions and molecules in lesser amounts30 (Table 1). Protein is only found in trace amounts compared to their values in blood plasma.