A dynamic character is a character who consciously does a lot of  things in order to make things happen- i.e is a catalyst for  other events. They could be described as ha â¦ ving a lot of get up  and go; they are motivated.
Hemagglutinin, any of a group of naturally occurring glycoproteins that cause red blood cells (erythrocytes) to agglutinate, or clump together. These substances are found in plants, invertebrates, and certain microorganisms.
Medical Definition of HA. hemagglutinin Seasonal strains â¦ evade our immune systems after vaccination or previous infection by constantly changing the structure of their hemagglutinin (HA) surface protein.âCharles J. Russell, The New England Journal of Medicine, 20 Oct. 2011.