The integumentary system of the body includes:
a. the skin
b. hair
c. specialized sense organs
d. all of the above
d. all of the above
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Which hormone ultimately stimulates the activity of osteoclasts and promotes increased calcium absorption in the digestive tract?
A. Triiodothyronine B. Calcitonin C. Parathyroid hormone (PTH) D. Growth hormone (GH) E. Somatostatin
An adaptation of the epithelial cells of the proximal convoluted tubule for reabsorption is
A) secreting enzymes that activate absorption of substances. B) rugae folds that increase surface area. C) microscopic projections called microvilli. D) thin walls.
The hyoid bone is part of the ________ skeleton.
A. axial B. appendicular
Which of the following is the immune cell that is most affected by aging?
a. B cell b. Cytokine c. Macrophage d. T cell