Most people retain adequate kidney function in old age. Why?
A. Nephrons use blood more efficiently.
B. Glomeruli grow new blood vessels through life.
C. A loss of nephrons does not radically impair function because there are so many to begin with.
D. Decreased activity in old age leads to a decrease in production of toxins.
E. Older people drink less fluid and therefore have less need to produce urine.
C. A loss of nephrons does not radically impair function because there are so many to begin with.
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Which type of lymphocyte responds to multiple antigens?
A. Memory T-lymphocyte B. Cytotoxic T-lymphocyte C. Natural killer cell D. Plasma cell E. Memory B-lymphocyte
Regarding the tonicity and osmolarity of solutions, which of the following statements is not true?
A. Hypoosmotic solutions are always hypotonic. B. Isotonic solutions are always isoosmotic. C. The term "tonicity" refers to the effect that a solution has on the degree of stretch or shrinking of the cell membrane. D. Hypertonic solutions are always hyperosmotic. E. The term "osmolarity" refers to the osmotic properties of a solution, regardless of its tonicity.
Which vessel in the figure is labeled "B" ?
a) left femoral vein b) left great saphenous vein c) left popliteal vein d) left anterior tibial vein e) left fibular vein
Which of the following is a function of a plasma membrane protein?
A) molecular transport through the membrane B) forms a lipid bilayer C) circulating antibody D) oxygen transport