Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones.
A singular subject is a noun or a pronoun for just one person, place, or thing. A plural subject is a noun or a pronoun that is two or more persons, places, or things. Exampl â¦ es: Singular subject: The boy came for lunch. He was hungry. Plural subject: The boys came for lunch.
1 the subject of a talk, a piece of writing, a person's thoughts, or an exhibition; a topic. 2  first major constituent clause, indicating subject-matter, typically being subject optionally other constituents, â poor not. â.  an idea that recurs in or pervades a work of art or literature.