volume definition, meaning, what is volume: the amount of space that is contained within an object or solid shape: . Learn more.
However, parathyroid hormone and calcitonin work together to control calcium levels in the blood. The blood calcium level is the main stimulus for the release of these hormones, as the release of these hormones is not controlled by the pituitary.
Parathyroid glands secrete a hormone called PHT. The PHT regulates the exchange of calcium between the blood and the bones. When the parathyroid gland is over active, too much calcium is pulled out of the bones. This is called hyperparathyroidism or parathyroid disease. Bones need calcium for strength.The brain needs calcium to think and muscles need calcium to contract. Too little calcium in the bones will cause a serious condition called osteoporosis (brittle bone disease).ymptoms of hyperparathyroidism include: 1  No symptoms at all. 2  Confusion, foggy thinking. 3  Muscle cramps. 4  A tingling sensation in the hands and feet. 5  Loss of energy, always tired. 6  Trouble sleeping, waking up at night. 7  Feeling bad, but not able to say the reason. 8  Loss of interest in activities, inability to concentrate.