What direction do veins carry blood?

Veins are responsible for carrying blood back to the heart, which is why the correct answer is that they carry blood towards the heart. This is an essential part of the circulatory system. After oxygen is delivered to the body's tissues through arteries, the deoxygenated blood returns through the veins.

Understanding the role of veins also highlights their function in collecting blood from various parts of the body and returning it to the heart. In particular, the superior and inferior vena cavae are large veins that transport blood from the upper and lower body, respectively, directly into the right atrium of the heart. From there, blood can be sent to the lungs for re-oxygenation before being pumped out again through the arteries to supply the body.

This process is vital for maintaining circulation and ensuring that blood, which carries nutrients and oxygen, continues to flow throughout the body effectively.