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.
To calculate the percent composition (by mass) of each element in a compound: 1. Determine the compoundâs molar mass (or formula mass). 2. Divide the total mass of each element by the compoundâs total mass. 3. Multiply that fractional mass by 100.