Vocal folds. The vocal folds, also known commonly as vocal cords or voice reeds, are composed of twin infoldings of mucous membrane stretched horizontally, from back to front, across the larynx. They vibrate, modulating the flow of air being expelled from the lungs during phonation.
Some recent clinical studies show that vitamin D deficiency is closely related to thyroid problems. This article identifies the thyroid problems linked with vitamin D deficiency and discusses how vitamin D supplementation can help treat thyroid disorders.
Effect on Parathyroid Hormones. Vitamin D in your body interacts with, and has an effect on the secretion of, hormones from your parathyroid glands. The glands -- located in your neck -- secretes parathyroid hormone, a signaling molecule that helps to regulate calcium in your body.