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.
Water at rest; i.e., ponds, lakes, reservoirs, and in the soil, is measured in units of volume â gallon, cubic foot, acre-inch, and acre-foot. Cubic Foot - The volume of water that would be held in a. container one foot wide by one foot long by one foot deep. Acre-lnch - The volume of water that would cover one acre. (43,560 square feet) one inch deep. Acre-Foot - The volume of water that would cover one acre. one foot deep. Flow Units. Water in motion; i.e., flowing in streams, canals, pipe-. lines, and ditches, is measured in units of volume per unit of. timeâgallons per minute (gpm), cubic feet per second (cfs), acre-inches per hour and acre feet per day.