Beta-adrenergic agonists or Beta-agonists are medications that relax muscles of the airways, which widens the airways and results in easier breathing.They are a class of sympathomimetic agents which act upon the beta adrenoceptors. In general, pure beta-adrenergic agonists have the opposite function of beta blockers.ost agonists of the beta receptors are selective for one or more beta-adrenoreceptors. For example, patients with low heart rate are given beta agonist treatments that are more cardio-selective such as dobutamine, which increases the force of contraction of the heart muscle.
A character is a person presented in a dramatic or narrative work, and characterization is the process by which a writer makes that character seem real to the reader. A hero or heroine, often called the protagonist, is the central character who engages the readerâs interest and empathy. The antagonist is the character, force, or collection of forces that stands directly opposed to the protagonist and gives rise to the conflict of the story.
Protagonist vs. Antagonist Characters. Nearly every story has at least one protagonist. A protagonist is a main character who generates the action of a story and engages the reader's interest and empathy. The protagonist is often the hero or heroine. For example, in the popular Divergent trilogy, the protagonist is Tris. The story is told from her point of view, and she is central to all the action the plot. The protagonist is usually a well-developed character; in this way, she is more relatable. The opposite of the protagonist is the antagonist. An antagonist is a character who opposes the protagonist. In that same book series, Tris is opposed both by Eric, a sadistic trainer, and Jeanine Matthews, a cold-hearted, prejudiced scientist.