题目内容

______, which is released from lysosomes, is belived to digesting collagen and other organic substance.

A. protein-digesting enzymes
B. lactic acid
C. citric acid
D. calcitonin

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_____ is secreted by the pituitary gland.

A. GH
B. PTH
CT
D. HCG

Parathormone is synthesized by the _____.

A. thyroid gland
B. adrenal gland
C. parathyroid gland
D. thymus gland

The loss of calcium from bones might lead to _____.

A. osteoporosis
B. paget's disease
C. anemia
D. calcemia

A decrased ability to produce the organic portion of bone matrix may cause the elders' bone susceptible to _____.

A. fracture
B. osteoma
C. arthritis
D. neoplasm