Which of the following is not an excretory organ in the human body?                              

The heart is not an excretory organ in the human body. The function of the heart is to pump blood around the body and carry waste. Therefore, the correct answer is the heart.

The lungs help in the excretion of carbon dioxide and water vapor during respiration.

The skin excretes sweat, which contains water, salt, and other waste products.

The kidneys are important excretory organs that filter waste products from the blood and excrete them in the form of urine.