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 singular noun is a word for one person, place, or thing. A plural  noun is a word for two or more people, places, or things.    Some nouns form a plural by adding th â¦ e S or ES to the singular noun  (frog, frogs, church, churches).