Vitamin D is important for bone health because it also directly performs which function of PTH?   A. Increased osteoclast activity   B. Decreased reabsorption of phosphate   C. Increased absorption of calcium from the small intestine

If the secretion of parathyroid hormone (PTH) increases, osteoclastactivity and blood Ca2+levels .a. decreases, decrease c. increases, decreaseb. decreases, increase d. increases, increase

34. Which of the following statements about bone cells is true?  a. osteoclasts are bone-forming cells that synthesize bone matrix b. osteoblasts are bone-destroying cells that break down bone matrix c. osteocytes are immature bone cells that maintain bone matrix d. osteogenic cells are stem cells giving rise to all bone cells e. none of the above

The thyroid stimulated to secrete thyroid hormone by a stimulating hormone released by which gland or glands?A. Pituitary gland B. Pancreas . C. Parathyroid D. Adrenal glands

Additional growth hormone(steroids) could increase human head size because...   a. Growth hormone directly stimulates bone growthb. Growth hormone stimulates protein synthesis in skeletal musclec. IGF-1 stimulates bone growth and is affected by growth hormone

Chronic vitamin D deficiency results in which of these consequences?a. Bones become brittle.b. The percentage of bone composed of hydroxyapatite increases.c. Bones become soft and pliable.d. Scurvy occurs.e. Both a and b are correct.

What effect does calcitonin have on the calcium concentrations of bone?   A. ) no effect on bone calcium         B.) decreases bone calcium         C.) stimulates bone osteoclasts         D.) increases bone calcium

Which of the following hormones is not known to directly affect bone growth?   a. insulin     b. estrogen     c. testosterone     d. growth hormone

When blood calcium levels are low, PTH stimulates ________. a. urinary excretion of calcium by the kidneys b. a reduction in calcium absorption from the intestines c. the activity of osteoblasts d. the activity of osteoclasts

An increasing of which hormone level would cause the kidneys to secrete /excrete more calcium ? A, Cartisol B,prolactin C, Calcitonin