Biology Regents Practice Exam

What two body systems work together to remove waste from the body?

1. Digestive and circulatory

2. Immune and respiratory

3. Circulatory and excretory

4. Skeletal and nervous

The correct answer is: Circulatory and excretory

The collaboration between the circulatory and excretory systems is essential for waste removal from the body. The circulatory system is responsible for transporting blood throughout the body, which carries nutrients, oxygen, and metabolic waste products. As blood circulates, it passes through the kidneys, which are crucial components of the excretory system. The kidneys filter out waste products, excess salts, and water from the blood, forming urine, which then travels through the ureters to be stored in the bladder before being expelled from the body. This process helps maintain homeostasis by regulating the body’s internal environment, including fluid balance and electrolyte levels. The direct relationship between these systems ensures that harmful substances are efficiently removed, contributing to the overall health and functionality of the organism.