When the blood calcium is low, the bones in the body release calcium to supplement it. This is a condition which is known as hypocalcemia.
When blood calcium levels are low, it means that calcium is not being reabsorbed in the intestine or released from the bones. This could lead to uncontrollable twitching, known as a disorder called tetany, caused by low blood calcium levels.
The calcium is released from bones and absorbed by the kidneys and the intestines, then the blood calcium level increases.
Low blood calcium. Calcitonin decreases blood calcium therefore it would result in an even lower amount of calcium.
calcitonin
Parathyroid hormone
bone
bone
The parathyroid glands are responsible for monitoring the calcium level in the blood. When the calcium level is too low, the parathyroids produce parathyroid hormone (PTH) to increase the calcium level in our blood.
bone
"The amount of calcium in the blood is regulated by two organs: thyroid and parathyroid glands. Each gland produces hormones by sensing the amount of calcium in the blood. When calcium is high in the blood, the thyroid gland produces calcitonin, which results in the removal of excess calcium from the blood. When calcium is low in the blood, the parathyroid gland produces parathyroid hormone, which causes the release of calcium from bone into the blood."
Calcitonin
Hypocalcemia is the condition resulting from abnormally low levels of calcium in the blood.