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 linenoun [ C, usually singular ] specialized. âº the space at the top of an email in which a line of text is written that tells you what the email is about, or the line of text itself: The email subject line was blank. He thought of a great subject line for the next marketing campaign.