Which components make up the circulatory system?

Which components make up the circulatory system?

• A. Lungs and airways
• B. Heart, arteries, veins, and capillaries that transport blood
• C. Stomach and intestines
• D. Brain and spinal cord

Answer: (B)

Understanding how the circulatory system works helps: it is the body's network that moves blood to deliver oxygen and nutrients and to remove wastes. The heart acts as the pump, pushing blood through arteries that carry it away, veins that return it, and capillaries that connect them and allow exchange with tissues. These vessels and the heart together make up the circulatory system because their main job is to transport blood throughout the body. The lungs and airways are part of the respiratory system, aiding gas exchange but not the transport network itself. The stomach and intestines belong to the digestive system, processing food and absorbing nutrients. The brain and spinal cord are part of the nervous system, which controls and coordinates body functions.

Understanding how the circulatory system works helps: it is the body's network that moves blood to deliver oxygen and nutrients and to remove wastes. The heart acts as the pump, pushing blood through arteries that carry it away, veins that return it, and capillaries that connect them and allow exchange with tissues. These vessels and the heart together make up the circulatory system because their main job is to transport blood throughout the body. The lungs and airways are part of the respiratory system, aiding gas exchange but not the transport network itself. The stomach and intestines belong to the digestive system, processing food and absorbing nutrients. The brain and spinal cord are part of the nervous system, which controls and coordinates body functions.