List of North American cities by population. This list of North American cities by population ranks cities based on the latest available official government census figures, estimates or projections for mid-year populations (unless otherwise noted) living within city limits. All cities with a population exceeding 500,000 are included. 1  1 List.  2 See also.
The pituitary gland sends signals to other glands, for example the thyroid gland, to produce hormones, such as thyroid hormone. The hormones produced by the pituitary gland and other glands have a significant impact on bodily functions, such as growth, reproduction, blood pressure, and metabolism.umors can cause damage to the pituitary gland or hypothalamus and can therefore result in a loss of function. Damage to the pituitary gland can also be caused by radiation, surgery, infections such as meningitis, or various other conditions. In some cases, the cause is unknown.
The four parathyroid glands are usually on the back of the thyroid gland, but they can be located around the jaw or neck. 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).Too much calcium in the blood increases the risk of having a stroke and can make people feel sick.ones 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).