Which body system is primarily responsible for transporting nutrients, gases, and wastes throughout the body?

Which body system is primarily responsible for transporting nutrients, gases, and wastes throughout the body?

• A. Digestive system
• B. Endocrine system
• C. Integumentary system
• D. Circulatory system

Answer: (D)

The circulatory system moves nutrients, gases, and wastes throughout the body. It uses the heart, blood, and blood vessels to form a transport network that delivers substances to every cell. Nutrients absorbed from the digestive tract enter the bloodstream and are carried to tissues where they’re needed. Oxygen, picked up in the lungs, is transported by blood to cells, while carbon dioxide produced by cells is carried back to the lungs to be exhaled. Waste products are also moved via the bloodstream to organs that eliminate them, such as the kidneys and lungs. While other systems handle specific tasks—digestion processes nutrients, the endocrine system communicates through hormones, and the integumentary system protects and helps regulate temperature—the circulatory system is the primary means of moving these substances around the body.

The circulatory system moves nutrients, gases, and wastes throughout the body. It uses the heart, blood, and blood vessels to form a transport network that delivers substances to every cell. Nutrients absorbed from the digestive tract enter the bloodstream and are carried to tissues where they’re needed. Oxygen, picked up in the lungs, is transported by blood to cells, while carbon dioxide produced by cells is carried back to the lungs to be exhaled. Waste products are also moved via the bloodstream to organs that eliminate them, such as the kidneys and lungs. While other systems handle specific tasks—digestion processes nutrients, the endocrine system communicates through hormones, and the integumentary system protects and helps regulate temperature—the circulatory system is the primary means of moving these substances around the body.