Excretion is defined as which of the following?

Excretion is defined as which of the following?

• A. The end result of cellular metabolism (waste products)
• B. The filtration of blood through the glomerulus
• C. The process of forming urine
• D. The storage of urine in the bladder

Answer: (A)

Excretion means the removal from the body of waste products produced by metabolism. These wastes are the end products of cellular activity that must be eliminated to keep the body's internal environment stable. The kidneys help by filtering blood and forming urine, but filtration is a step inside the process of urine production, not the act of removing waste from the body itself. Urine formation encompasses filtration, reabsorption, and secretion, while storage in the bladder is simply holding urine, not excretion. So the defining idea is the elimination of metabolic waste from the body, which is why the end products of cellular metabolism are the best answer.

Excretion means the removal from the body of waste products produced by metabolism. These wastes are the end products of cellular activity that must be eliminated to keep the body's internal environment stable. The kidneys help by filtering blood and forming urine, but filtration is a step inside the process of urine production, not the act of removing waste from the body itself. Urine formation encompasses filtration, reabsorption, and secretion, while storage in the bladder is simply holding urine, not excretion. So the defining idea is the elimination of metabolic waste from the body, which is why the end products of cellular metabolism are the best answer.