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 simple subject is a noun (person, place, or  thing) or pronoun that is doing the action (the verb). The word  order in a basic English sentence is subject, verb, object (â¦ the  object is the 'receiver' of the action).    Example sentence: The man saw the bus.