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.
Some nouns are used only in the singular, even though they end in-s. These include: the names of academic subjects such as classics, economics, mathematics/maths, physics; the physical activities gymnastics and aerobics; the diseases measles and mumps; and the word news : Maths was never my best subject at school.