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.
A subject pronoun is a pronoun that replaces a noun as the subject  of a sentence or a clause.   The subject pronouns are: I, you, he, she, it, we, they, and who.    â¦Examples:    Instead of saying:   John watched a movie. (replace the subject noun John with the  pronoun he)   He watched a movie.