A normal adult thyroid gland weighs 10 to 20 g and receives blood from bilateral superior and inferior thyroid arteries and a small artery called the thyroid ima. The thyroid secretes two hormones. Thyroxine (T 4) makes about 90% of hormone production, and triiodothyronine (T 3) produces the other 10%.
Fast Growing Cold Hardy Tree. - Grows up to 5 ft per year! The Quaking Aspen is well known for thriving in cold climates and poor soil... but it's also a brightly colored tree with many desirable characteristics.
While the majority of these coniferous tree species have a fairly unremarkable average growth rate (between 6 inches and 11 inches per year), the Sitka spruce (Picea sitchensis), Norway spruce (Picea abies) and Colorado blue spruce (Picea pungens glauca) are renowned for their extraordinarily fast rates of growth.