Kidneys maintain acid-base balance in the body by
a. removing hydrogen ions from all the sources in the body.
b. excreting bicarbonate ions rapidly when acidity of body fluid decreases.
c. secreting ammonia into the urine.
d. removing hydrogen ions and secreting ammonia into the urine.
e. removing hydrogen ions, secreting ammonia into the urine, and excreting bicarbonate ions when body fluid acidity decreases.
E
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Cells that produce myelin for cells outside the brain and spinal cord are the:
a. Schwann cells b. microglia c. astrocytes d. oligodendrocytes
When should prevention of osteoporosis start?
The prevention of osteoporosis should begin with children while bones are still growing. Children should increase their bone mass to provide additional protection from osteoporosis in the future. The prevention of osteoporosis should start in early old age, to prevent a decrease in bone density in the future. The prevention of osteoporosis should start in middle age, to counter the gradual loss of bone density as we get old. The prevention of osteoporosis should begin young adults, to increase the bone mass to provide additional protection from osteoporosis.
People who experience hypoxia produce characteristic signs of cyanosis and respiratory distress
Indicate whether the statement is true or false
Each of the following statements concerning hair is true except
A) the medulla is the soft core of the hair. B) the cortex of the hair is composed of hard keratin. C) terminal hairs are heavy and more darkly pigmented than other types of hair. D) club hair is hair that has ceased growing. E) scalp hairs grow constantly throughout life.