I'm doing the gland thyroid and parathyroid. The hormones are... t4, t3, calcitonin, and parathryroid hormone. Why are these hormones important to the maintenance of homeostasis?
2007-03-26 14:22:01 · 4 answers · asked by somebody 3 in Science & Mathematics ➔ Biology
A negative feedback system involving 2 antagonistic hormones, calcitonin and parathyroid hormone (PTH), maintains the concentration of calcium in the blood.
The narrow range is between 9-11 mg.per 100 ml of blood.
a). A rise of calcium concentration induces the thyroid gland to secrete calcitonin, which lowers the calcium concentration by increasing bone deposition and reducing the calcium uptake in the intestine and the kidneys.
b). When the calcium concentration falls below the recommended level PTH reverses the effects of calcitonin. PTH is secreted by the parathyroid gland.
Hormonal control of blood glucose:
Another negative feedback system involving 2 antagonistic hormones, insulin and glucagon. The ideal glucose level in humans is 90 mg/100 ml of blood. A rise of glucose in the blood triggers the beta cells of the pancreas to produce and release insulin, which acts on the target cells. When blood sugar is too low, the alpha cells of the pancreas respond to release glucagon which causes the break down of glycogen in the liver into glucose. This glucose is released into the blood.
2007-03-26 16:47:36 · answer #1 · answered by ATP-Man 7 · 0⤊ 0⤋
Thyroid hormones (t3 and t4) can be crudely thought of as indicators for level of metabolic rate. If our metabolic rate goes to slow (because of low levels of these hormones) we appear sluggish, have slow heart rates, etc. - HYPOTHYROIDISM
The opposite occurs if our metabolic rates are too high (HYPERTHYROIDISM)
Calcitonin and parathyroid hormone are hormones that have effect on calcium metabolism. If the balance of these hormones is out we could become HYPERCALCAEMIC or HYPOCALCAEMIC
2007-03-26 14:30:12 · answer #2 · answered by Orinoco 7 · 1⤊ 0⤋
T-3 and T4 aid in growth and development
Calcitonin lowers blood calcium
Parathyroid hormone raises blood calcium
Calcitonin and PTH are antagonists, the produce opposite effects on the body.
2007-03-26 14:31:02 · answer #3 · answered by Misty M 4 · 0⤊ 0⤋
The Maintenance Of Homeostasis
2017-02-25 09:06:17 · answer #4 · answered by ? 4 · 0⤊ 0⤋