Which organs are primarily involved in the excretory system?

The organs primarily involved in the excretory system are the kidneys and the bladder. The kidneys play a crucial role in filtering blood, removing waste products and excess substances, which are then converted into urine. This urine is stored in the bladder until it is ready to be excreted from the body.

Understanding the function of these organs is essential, as their primary responsibility is to regulate the body’s fluid balance and eliminate harmful substances. The kidneys filter out toxins and waste materials, maintaining homeostasis by regulating electrolytes, blood pressure, and maintaining the acid-base balance in the body. The bladder serves as a temporary storage space for urine, allowing for controlled elimination through the urethra.

In contrast, the liver and lungs also play important roles in the body's overall function—such as detoxifying substances and exchanging gases—but they are not part of the excretory system's primary function. The heart and blood vessels are part of the circulatory system, responsible for transporting blood, and the stomach and intestines are involved in the digestive system, focusing on the breakdown and absorption of nutrients rather than waste elimination. Thus, the kidneys and bladder are the core components of the excretory system.