Washington's Birthday, also known as Presidents' Day, is a federal holiday held on the third Monday of February. The day honors presidents of the United States, including George Washington, the USA's first president. George Washington was the first president of the United States of America.
Complement component 5 is a protein that in humans is encoded by the C5 gene.Complement component 5 is involved in the complement system. It is cleaved into C5a and C5b: 1  C5a plays an important role in chemotaxis.2  C5b forms the first part of the complement membrane attack complex.omplement component 5 is the fifth component of complement, which plays an important role in inflammatory and cell killing processes.
The complement is the amount you must add to something to make it whole. For example, in geometry, two angles are said to be complementary when they add up to 90Â°. One angle is said to be the complement of the other. In the figure below, angles PQR and RQS are complementary. RQS is the complement of PQR.