Biography. After five gold medals at the 1967 Pan American Games, great things were expected of Mark Spitz at the 1968 Olympics, but he surprisingly failed to win an individual event. Before the 1972 Olympics, however, Spitz became undoubtedly the world's greatest swimmer, and considered by many the greatest ever.iography. After five gold medals at the 1967 Pan American Games, great things were expected of Mark Spitz at the 1968 Olympics, but he surprisingly failed to win an individual event. Before the 1972 Olympics, however, Spitz became undoubtedly the world's greatest swimmer, and considered by many the greatest ever.
What substance is release by the mast cells in response to allergic reaction? Histamine is the primary effector substance released by the mast cell in response to an allergy. When you have an allergy to something, you exhibit certain common symptoms. Retired college science professor. Member of Beta Beta Beta Biological Honor Society, ACS & AAAS.
An allergen is something that triggers an allergy. When a person with allergic rhinitis breathes in an allergen such as pollen, mold, animal dander, or dust, the body releases chemicals that cause allergy symptoms. Hay fever involves an allergic reaction to pollen.