Chapter 7 Part 3
Hypocalcemia
low blood calcium
Parathyroid
A hormone is secreted and produced by the parathyroid glands.
Parathyroid Hormone
A low blood calcium level stimulates the releases of which hormone
Mineral Crystallization
A process in which calcium, phosphate,and other ions taken from the blood plasma and deposited in bone tissue.
Kidneys, small intestines and skeleton
Calcitriol acts on which organs to raise blood calcium levels.
Rickets
Children with inadequate calcium in their diet may develop soft bones and a condition known as
Mineral resportion
Dissolving bone and releasing mineral into the blood and make them available for other uses
hypercalcemia
If a patient has abnormally high blood calcium levels, they are said to have a condition called
Phosphatase
Osteoclasts produces acid _______ to break down collagen fibers in bone matrix.
Hormones that affect bone growth and development
Testosterone, Estrogen, Calcitonin, Parathyroid hormone
The Bones
Where is 99% of calcium is found in the human body?
Calcitonin : Osteoblast stimulation
Within an hour, calcitonin increases the number and activity of osteoblasts, which deposit calcium into the skeleton.
Calcitonin : Osteoclast inhibition
after 15 min after it is secreted, calcitonin reduces osteoclast activity by as much as 70%, so osteclasts liberate less calcium from the skeleton.
Calcitonin
is secreted by C cells (clear cells) of the thyroid gland. It is secreted when the blood calcium concentration rises too high, and it lowers the concentration by two principle mechanisms.
Calcium and phosphate
needed by osteoblasts for deposition into the bone matrix, come from the blood
Parathyroid Hormone
reduces the excretion of calcium by the kidneys
Osteoclasts
responsible for resorption of minerals from bone matrix
Ectopic
the formation of osseous tissue in areas outside of bone is called _________ossification
Osteomalacia
the softening of the bones in adults due to calcium depletion
Hydrochloric Acid
what do osteoclasts use to dissolve bone matrix?