T cells mature in the ________.
Fill in the blank(s) with the appropriate word(s).
thymus
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Carrie is being examined by her dentist, who notices that she has many cavities (caries). When she tells him about her dental regimen, he explains to her that she doesn't brush her teeth often enough to remove the bacteria that ________, which is why she has so many cavities.
A. directly secrete acids that dissolve enamel B. destroy the gums so that the teeth loosen C. infect the gums, causing dental caries D. metabolize carbohydrates in food, producing acidic by-products that damage enamel and dentin
In some cases the epiphyseal plate of the long bones of children closes too early. What might be the cause?
overproduction of thyroid hormone osteoblast activity exceeds osteoclast activity elevated levels of sex hormones
Generally, most water reabsorption in a nephron occurs at the
A. proximal convoluted tubule and is called facultative water reabsorption. B. nephron loop and is called obligatory water reabsorption. C. nephron loop and is called facultative water reabsorption. D. proximal convoluted tubule and is called obligatory water reabsorption.
Cartilaginous joints unite two bones by means of ________.
A. capsules B. cartilage C. collagen fibers D. synovial membranes