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.
Briefly explain why veins are called blood reservoirs and state where in the body venous blood reservoirs. are most abundant. Briefly explain why blood flow in large, thick-walled arteries, such as the aorta and its branches, is fairly.continuous and does not stop when the heart relaxes.lood flows from high to low pressure. Hence, it flows from the high-pressure arteries through the capillaries and. then through the low-pressure veins. Because blood pressure contributes less to blood propulsion in veins, special. measures are required to ensure that venous return equals cardiac output.