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.
subject definition A part of every sentence. The subject tells what the sentence is about; it contains the main noun or noun phrase: âThe car crashed into the railingâ; âJudy and two of her friends were elected to the National Honor Society.â