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.
It is among the faster-growing oaks, averaging 12 to 15 feet over a 5- to 7-year period. Pin oak can grow to be one of the largest oak trees. It makes an impressive street tree. However, bacterial leaf scorch can be a devastating disease for monocultures of pin oaks as street trees.