Source: Extra Practice
In the human excretory system, what is the main function of the kidneys?
Options
Option A
To pump blood throughout the body.
Option B
To digest food and absorb nutrients.
Option C is correct
To filter waste products like urea from the blood and produce urine.
Option D
To produce hormones for body regulation.
Explanation
The kidneys are vital organs in the human excretory system. Their primary function is to act as filters, removing metabolic waste products such as urea, excess salts, and water from the blood. This filtered waste is then converted into urine, which is subsequently transported out of the body. Options 1, 2, and 4 describe functions of the heart, digestive system, and endocrine system, respectively, not the kidneys' main excretory role.