Capillaries are the smallest and most fragile of the body's blood vessels. They are responsible for what is known as microcirculation, meaning that they create a circulatory network within the organs of the body. There are three different types found in the human body: continuous, fenestrated, and sinusoidal.
1 Find the empirical formula. 2  Get the mass of each element by assuming a certain overall mass for the sample (100 g is a good mass to assume when working with percentages). 3  Convert the mass of each element to moles.  Find the ratio of the moles of each element.
Mass percent composition (of an element X) The elements percentage of the total mass of a particular compound. The equation to use is: Mass % element X = (mass of X in sample of the compound/mass of the sample of the compound) x 100% if the mass of the elements in a sample of compound is given.