Which one of the following accurately pairs the blood vessel type with its function? A. Arteries – carry blood to the heart B. Capillaries – work to exchange gases and nutrients with tissues C. Veins – carry blood away from the heart D. Aorta – carry oxygen-poor blood only
B is the correct answer. Arteries always carry blood away from the heart, while veins always carry blood to the heart. The aorta is an artery and transmits oxygen-rich blood to the body. Capillaries are where gas exchange occurs, therefore, B is the correct answer.