The system that carries nutrients and gases throughout a person’s body is called the circulatory system. The heart is an organ in the circulatory system. The heart works by pumping blood, which is a liquid that contains the nutrients and gases. When the heart pumps the blood, the blood travels throughout the body inside tubes called blood vessels.

Question

Which of these is true?
A.
All the different parts of the circulatory system do exactly the same job.
B.
If the heart was removed or damaged, the circulatory system could still work at its best.
C.
The heart makes it harder for the circulatory system to get nutrients and gases to the body.
D.
The heart helps a person survive by getting nutrients and gases to all parts of the body.

Answer 1

D. The heart helps a person survive by getting nutrients and gases to all parts of the body.