When we add sugar to tea or coffee we might not really reflect on how much sugar we scoop up. What is one teaspoon for you may actually be two ârealâ teaspoons, which would mean you are actually consuming more calories than you thought. A normal teaspoon of sugar vs a heaped teaspoon of sugar.
they are inversely proportional (increasing area decreases velocity) therefore in large vessels like the vena cava, blood has a low velocity blood also has a low velocity in the capillary beds, because of the increased cross-sectional area produced by many capillaries.
Report Abuse. The heart has 4 valves, these restrict the flow of blood depending on the difference of pressure between one side and the other, when the pressure difference is on one direction they are pushed open and blood flows, in the opposite direction they are forced shut and blood cannot flow.