Osteocytes receive nutrient molecules directly from their contacts with:
a. Capillaries
b. Gap junctions on processes of other osteocytes
c. Lymphatic vessels
d. Osteoclasts
e. The periosteum
ANS: B
Osteocytes, surrounded by calcified matrix, would have no access to nutrient molecules unable to diffuse through this matrix from capillaries if they were not able to pass along these molecules to each other via gap junctions.
You might also like to view...
The enzyme pepsin becomes active when pH is
A. high. B. low.
Match the appropriate characteristic with the type of immunity.A. Innate immunityB. Antibody-mediated immunityC. Cell-mediated immunityD. Both antibody-mediated and cell-mediated immunityE. Innate immunity, antibody-mediated immunity, and cell-mediated immunityTears and saliva
Fill in the blank(s) with the appropriate word(s).
Excitation of the Golgi tendon organ normally causes ________.
A. relaxation of a muscle's intrafusal fibers B. contraction of a muscle's intrafusal fibers C. contraction of a muscle's extrafusal fibers D. relaxation of a muscle's extrafusal fibers
The membranes that line the thoracic and abdominopelvic cavities and most of the internal organs are referred to as ________.
A. cutaneous membranes B. mucous membranes C. synovial membranes D. serous membranes