Which body system includes the heart, blood vessels, and blood and is responsible for transporting oxygen and nutrients throughout the body?

Which body system includes the heart, blood vessels, and blood and is responsible for transporting oxygen and nutrients throughout the body?

• A. Circulatory system
• B. Digestive system
• C. Excretory system
• D. Immunological system

Answer: (A)

The circulatory system is the network that moves blood, which carries oxygen and nutrients, throughout the body. The heart acts as a pump, pushing blood through arteries to every tissue and returning it through veins. In the blood, oxygen from the lungs and nutrients from digested food travel to cells that need them, while carbon dioxide and other wastes are carried away for removal. This system also helps regulate body temperature by distributing heat. Other options describe systems focused on digestion, waste elimination, or immune defense, not the transport network that sustains all body cells.

The circulatory system is the network that moves blood, which carries oxygen and nutrients, throughout the body. The heart acts as a pump, pushing blood through arteries to every tissue and returning it through veins. In the blood, oxygen from the lungs and nutrients from digested food travel to cells that need them, while carbon dioxide and other wastes are carried away for removal. This system also helps regulate body temperature by distributing heat. Other options describe systems focused on digestion, waste elimination, or immune defense, not the transport network that sustains all body cells.