Because you touch yourself.
Its the hormone calcitonin. Calcitonin lowers calcium and phosphate and increases the excretion of these ions by the kidneys; whereas the parathyroid hormone increases the amount of calcium in the blood.
The so-called "Isles of Langerhans" in the pancreas produce the hormone, 'Insulin', which lowers high sugar levels in the bloodstream."Glucagon (GLOO-kuh-gone) is a peptide hormone also produced in the pancreas that raises low sugar levels in the bloodstream.
Amylin
It is a hormone, so the target area is blood. It transfers to different organs through the blood.
If you are looking for the one hormone that does this, then the answer is parathyroid hormone (PTH), produced in the parathyroid glands.A more technical description is given below:Three hormones act in the body to increase blood calcium levels to normal. These hormones are 1,25-Dihydroxycholecalciferol, parathyroid hormone (PTH), and calcitonin that originate respectively from the liver and kidneys, parathyroid glands, and thyroid glands. The first, 1,25-Dihydroxycholecalciferol (active vitamin D3), serves to increase calcium absorption from the intestine. The second, PTH, dissolves bone into the blood. The third, calcitonin, prevents the bone-derived calcium from being resorbed ("reabsorbed") into the bone from which it came via PTH. To summarize, these three hormones act in concert to raise calcium levels via external and internal routes.References: Ganong's Review of Medical Physiology, 23eKim E. Barrett, et. al. Chapter 23: Hormonal Control of Calcium & Phosphate Metabolism & the Physiology of Bone
Because you touch yourself.
It is a hormone. So mainly by blood
Aldosterone is a hormone, so it gets to the kidneys via the blood stream.
Tetany is caused by a disturbance of the blood calcium level. So you can say vitamin D (also considered a hormone) plays a role in it. Also, the parathyroid hormone level has a direct effect on calcium levels.
There is not an actual hormone which increases blood pressure. However, the hormone adrenaline is secreted by the pituitary gland and has the effect of speeding up the contraction of the heart muscle. In turn this leads to increased blood pressure due to Fick's Law. The stroke volume of the heart has increased so more blood is being forced through the network of blood vessels
When both ovaries are removed from a rat, the hormone that is decreased in the blood is estrogen. The ovaries are responsible for the production of estrogen, so their removal leads to a decrease in estrogen levels in the bloodstream.
Tetany is caused by a disturbance of the blood calcium level. So you can say vitamin D (also considered a hormone) plays a role in it. Also, the parathyroid hormone level has a direct effect on calcium levels.
because they are hormone-secreting and so they have to be in close contact with blood vessels
Its the hormone calcitonin. Calcitonin lowers calcium and phosphate and increases the excretion of these ions by the kidneys; whereas the parathyroid hormone increases the amount of calcium in the blood.
The so-called "Isles of Langerhans" in the pancreas produce the hormone, 'Insulin', which lowers high sugar levels in the bloodstream."Glucagon (GLOO-kuh-gone) is a peptide hormone also produced in the pancreas that raises low sugar levels in the bloodstream.
The plasma is replaces in the short term by releasing ADH (Anti-Diuretic Hormone) into the blood streem. This hormone makes the body hold onto more water so the body can put it into the plasma. The red blood cells are replaces over time by the bone marrow of the larger bones.
Amylin