Grandparents have always been important. Today, they're even more important. In busy, two-career and single-parent families, an involved grandparent goes a long way to filling a void for children. In extreme situations, the courts have found it's often a grandparent who can reach a troubled teen when no one else can.
Some people, genetically, are born with weaker or smaller veins than others - and some people are born with larger, and more flexible vein tissues. Due to genetics, some people just have poor, weak veins. This only affects the large return veins you can see however - the veins which transport the rest of your blood are likely fine. Regardless of the vein size, blood can still be drawn. I personally have smaller and weaker veins, and can still donate, but sometimes it takes a few tries.
Confidence votes 151. Arteries do not have valve s because the heart provides the pressure needed to send blood through the system. Veins have valves because venous pressure is often not great enough (as the blood must overcome gravity and other forces) to return the blood to the heart.onfidence votes 151. Arteries do not have valve s because the heart provides the pressure needed to send blood through the system. Veins have valves because venous pressure is often not great enough (as the blood must overcome gravity and other forces) to return the blood to the heart.