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.
You can't determine an acre in metres, any more than you can determine volume in acres (or hectares). Metres measure the distance between two points, whereas acre is width times length.The acre is a standard measurement in the UK (if an imperial one) for fields etc.The most famous account of such is the Hundred Acre Wood, used by A. A. Milne for Winnie the Pooh. plwimsett Â· 9 years ago.etres measure the distance between two points, whereas acre is width times length. The acre is a standard measurement in the UK (if an imperial one) for fields etc. The most famous account of such is the Hundred Acre Wood, used by A. A. Milne for Winnie the Pooh. plwimsett Â· 9 years ago.