It must be noted, however, that not all women experience bright red period blood. In fact, menstruation blood can be of numerous shades, including dark red, brown or black, orange and pale red or pink. Every shade has its own causes and some may be quite normal to experience whilst others may need medical treatment.
Proteins make up about 15% of our body mass. They are the most abundant 'solid' substances in our bodies. Each protein has its own precise function under the direction of its own gene. The shapes of proteins are of key importance. These are determined by the sequence of amino acids that make them up. Amino acids are the building blocks (monomers) of proteins. Twenty different amino acids are used to make the body's proteins.
1 What are proteins and what do they do?  What are proteins and what do they do? Proteins are large, complex molecules that play many critical roles in the body. They do most of the work in cells and are required for the structure, function, and regulation of the bodyâs tissues and organs. Proteins are made up of hundreds or thousands of smaller units called amino acids, which are attached to one another in long chains.