PTA Physical Therapy Assistant

Answer: A -Parathyroid hormone maintains the plasma calcium level.

The parathyroid hormone plays a role in absorption of calcium from bones, and also helps in intestinal absorption of calcium thereby maintains the critical narrow window calcium level (9.4 - 10 mg/dl) in blood.

The thyroid gland produces two thyroid hormones: thyroxine (T4) and triiodothyronine (T3) regulate how the body uses energy.

Thyroid stimulating hormone (TSH) is produced by the pituitary gland in order to stimulate the thyroid when there are insufficient thyroid hormones, as in hypothyroidism. The extra production of TSH in turn forms goiter, which is an abnormal enlargement of the thyroid gland.