Which do you expect to have the lowest blood pressure? A vein found halfway between the capillary and the heart A vein leading directly to the right atrium A postcapillary venule (vessel found immediately after the capillary)

A vein leading directly to the right atrium

Explanation:

The veins that end directly to the right atrium carry deoxygenated blood to the heart. These veins are different from the arteries in the following aspects -

These are less muscular and thin walled than the arteries. The lumen of these veins are also broader than the arteries.

The heart applies a negative type of pressure on the blood present in these veins because as the blood from the right ventricle gets pumped out the blood in the right atrium and nearest veins flows automatically forward according to the gradient and no extra pressure in needed in this process.