Thyroidectomy is used to treat thyroid disorders, such as cancer, noncancerous enlargement of the thyroid (goiter) and overactive thyroid (hyperthyroidism). How much of your thyroid gland is removed during thyroidectomy depends on the reason for surgery.If only a portion is removed (partial thyroidectomy), your thyroid may be able to function normally after surgery.If your entire thyroid is removed (total thyroidectomy), you need daily treatment with thyroid hormone to replace your thyroid's natural function. 1  Why it's done.f only a portion is removed (partial thyroidectomy), your thyroid may be able to function normally after surgery. If your entire thyroid is removed (total thyroidectomy), you need daily treatment with thyroid hormone to replace your thyroid's natural function. 1  Why it's done.
Percent of the brain used. 100 %. Average weight of a human brain. 3 pounds. Average weight of a human brain at birth. 12 ounces. Percent of total body weight that the brain represents. 2 %.
The brain consumes about 20% of all the bodyâs oxygen, even though it only ways about 3.5 pounds. When brain cells do die or are damaged for any reason, healthy neurons are assaulted by inflammatory chemicals, like cytokines, that are released by the brainâs immune cell system.