What is the liquid waste product that exits the body through the urethra?

The liquid waste product that exits the body through the urethra is urine. Urine is produced by the kidneys through a process that involves filtration, reabsorption, and secretion. The kidneys filter waste products and excess substances from the blood, resulting in the formation of urine. This liquid waste contains substances such as urea, creatinine, electrolytes, and water, which are eliminated from the body to maintain homeostasis.

When urine is formed, it collects in the renal pelvis of each kidney, travels down the ureters, and is stored in the bladder until it is expelled through the urethra. This process is essential for regulating the body’s fluid balance and removing harmful metabolic byproducts.

Blood, filtrate, and plasma do not represent the final waste product that is expelled from the body. Blood consists of red and white blood cells, platelets, and plasma, while plasma is the liquid component of blood. Filtrate refers to the early stages of urine production occurring in the nephron, before reabsorption and secretion have taken place, and is not the final output. Therefore, urine is the appropriate term for the waste product released through the urethra.