The Venous System Normally Contains ________ of the Blood Volume

Question

The venous system normally contains ________ of the blood volume (roughly 3.5L of whole blood).
A) 30-35%
B) 75-80%
C) 45-50%
D) 65-70%
E) 20-25%

Accepted Answer

The venous system normally contains 65-70% of the blood volume (roughly 3.5L of whole blood). This is because blood flows back to the heart through veins after circulating through the body's tissues. Veins have thinner walls and larger lumens than arteries, allowing them to hold more blood volume.