Bones appear to be lifeless structures. Does bone material renew itself?
What will be an ideal response?
Bone only appears lifeless in gross anatomy. Microscopically, bone is full of cells and blood vessels that maintain and renew bone tissue. Approximately 5% to 7% of our bone mass is recycled each week. Up to 0.5 g of calcium may enter or leave the bones each day, depending on the negative feedback hormonal mechanism and gravitational forces.
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A) are also called microbodies, and contain acid hydrolases B) are able to detoxify substances by enzymatic action C) function to digest particles ingested by endocytosis D) sometimes function as secretory vesicles
An increase in the parasympathetic activity ____________________ the AV-nodal delay
Fill in the blank(s) with correct word
Which of the following is NOT an effect of aging on the joints?
A. Decreased tissue repair B. Decreased range of motion C. Increased production of synovial fluid D. Weakening of muscles E. Decreased flexibility and elasticity
Increased blood calcium levels result in increased
A) secretion of calcitonin. B) osteoclast activity. C) secretion of parathyroid hormone. D) retention of calcium by the kidneys. E) excitability of neural membranes.