A striped racer, also known as the California whipsnake, is a species of non-venomous snake native to the coast and foothills of California. It is a long, slender, and fast-moving snake, identified by its distinctive stripes running down the length of its body. They primarily feed on lizards and small rodents. The scientific name for this species is Masticophis lateralis.
Vitamin d deficiency and dependency
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Inadequate exposure to sunlight predisposes to vitamin D deficiency. Deficiency impairs bone mineralization, causing rickets in children and osteomalacia in adults and possibly contributing to osteoporosis. Diagnosis involves measurement of serum 25(OH)D (D2 D3). Treatment usually consists of oral vitamin D; calcium and phosphate are supplemented as needed. Prevention is often possible. Rarely, hereditary disorders cause impaired metabolism of vitamin D (dependency).
Vitamin D deficiency is common worldwide. It is a common cause of rickets and osteomalacia, but these disorders may also result from other conditions, such as chronic kidney disease, various renal tubular disorders, familial hypophosphatemic (vitamin D–resistant) rickets, chronic metabolic acidosis, hyperparathyroidism, hypoparathyroidism, inadequate dietary calcium, and disorders or drugs that impair the mineralization of bone matrix.
Vitamin D deficiency causes hypocalcemia, which stimulates production of parathyroid hormone (PTH), causing hyperparathyroidism. Hyperparathyroidism increases absorption, bone mobilization, and renal conservation of calcium but increases excretion of phosphate. As a result, the serum level of calcium may be normal, but because of hypophosphatemia, bone mineralization is impaired.
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