When the level of thyroid hormones (T3 & T4) drops too low, the pituitary gland produces Thyroid Stimulating Hormone (TSH) which stimulates the thyroid gland to produce more hormones. Under the influence of TSH, the thyroid will manufacture and secrete T3 and T4 thereby raising their blood levels. +The pituitary senses this and responds by decreasing its TSH production. One can imagine the thyroid gland as a furnace and the pituitary gland as the thermostat.
Compared to vegetable oil, vegetable shortening is solid at room temperature, white in color, and much less prone to rancidity as it is a saturated fat. It has essentially an unlimited shelf life.It is also very neutral in flavor, so is often used to grease pans.egetable oil is converted into vegetable shortening by hydrogenating it, forcing hydrogen to bind on to the ends of the fatty acids. This is done by forcing hydrogen to bubble through the oil under pressure, heat, and in the presence of a catalyst.
Function. Hydrogenated vegetable shortening is used as substitute for fats from animal sources, such as lard or butter. Hydrogenated shortening is popular because it doesn't spoil as easily as liquid oils, can withstand repeated reheating and is easier to transport.istory. Hydrogenation was discovered in the late 19th century when chemists found that they could add hydrogen to unsaturated fats by passing hydrogen gas through vegetable oil in the presence of a nickel catalyst. Hydrogenated shortening became commercially available in 1911 with the introduction of Crisco.