Thyroids to control how quickly the body uses energy,

Thyroids are located directly under the larynx, with two
lobes on either side of the trachea, where its connected by a thin band of
tissue called isthmus. Thyroid have important physiological role which control
and produces various hormones. Common roles include to control how quickly the
body uses energy, makes protein and how sensitive it should be to other
hormones in the body. The hypothalamus and the pituitary controls the thyroid,
so when hormone levels drop the hypothalamus is responsible for the secretion
of TSH hormone, this triggers the pituitary which produces thyroid stimulating
hormones. This is how the thyroid performs its function. Thyroids produce
hormones such as thyroxine (T4), triiodothyronine (T3) and calcitonin. Thyroid
produce T3 and T4 as it has further physiological roles, such as increasing
cell metabolism in situations such as hypothyroidism, facilitate normal growth,
facilitate normal mental development and increase the local effects of
calcitonin. Calcitonin is involved in calcium homeostasis. Thyroids cells are
unique as they can take up iodine from foods and react with tyrosine to produce
T3 and T4, so when iodine levels are low production of T3 and T4 will also be
low leading to specific symptoms such involved in hypothyroidism such as
feeling cold, weight gain, lethargy and muscle aches.  Low levels of calcitonin would lead to a
swelling at the front of the neck which Suzan is suffering from known as goiter. 

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