The Thyroid itself secretes three main hormones: 1  Thyroxine contains iodine which is essential for the body's normal growth, and metabolism. 2  Triiodothyronine has similar functions to thyroxine. 3  Calcitonin causes a decrease in the concentration of calcium in the blood.
acre. acre, measure of land area used in the English units of measurement. The acre was originally the area a yoke of oxen could plow in a day and therefore differed in size from one locality to another.It is now fixed as 10 square chains or 160 square rods, i.e., 4,840 sq yd, 43,560 sq ft, or 1/640 sq mi. Share | Cite. acre, measure of land area used in the English units of measurement. The acre was originally the area a yoke of oxen could plow in a day and therefore differed in size from one locality to another. It is now fixed as 10 square chains or 160 square rods, i.e., 4,840 sq yd, 43,560 sq ft, or 1/640 sq mi.
The standard unit of measuring land in the United States is the ACRE. An Acre is equal to 43,560 square feet (Sq. Ft.) of area. An acre is also equal to 10 square chains (66 x 66 x 10 = 43560 Sq.Ft.) or 160 square rods (16.5 x 16.5 x 160 = 43,560 Sq. Ft.) There are exactly 640 Acres in one square mile.he standard unit of measuring land in the United States is the ACRE. An Acre is equal to 43,560 square feet (Sq. Ft.) of area. An acre is also equal to 10 square chains (66 x 66 x 10 = 43560 Sq.