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.
Acre furrow slice volumes and weights are often used by soil test labs as a means of expressing nutrient content per acre of soil. The typical soil volume used in acre furrow slice calculations is 24,394 cubic feet, and is determined by multiplying the number of square feet in an acre (43,560) by a depth of 0.56 feet (6.7 inches Ã· 12 inches = 0.56 feet). Determining the weight of soil in an acre furrow slice involves knowing the dry bulk density of the soil in question.