Each thin filament consists of
A) two actin protein strands coiled helically around each other.
B) chains of myosin molecules.
C) six molecules coiled into a helical structure.
D) a rod-shaped structure with "heads" projecting from each end.
E) a double strand of myosin molecules.
A
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Which one represents a second-class lever?
a) A b) B c) C d) All of these choices e) None of these choices
Red blood cells with an internal osmolarity of 300 mOsM are placed in the following solutions. Designate each solution according to its osmolarity and tonicity, and explain what happens to the cells and why.
A. 200 mOsM NaCl B. 400 mOsM urea C. 100 mOsM urea plus 200 mOsM NaCl D. 300 mOsM urea E. 300 mOsM NaCl F. 200 mOsM urea plus 300 mOsM NaCl G. 400 mOsM NaCl
The reabsorption of glucose occurs primarily through the walls of the
A) distal convoluted tubule. B) glomerular capsule. C) proximal convoluted tubule. D) nephron loop.
Yellow bone marrow contains a high amount of ________
A) elastic tissue B) blood-forming cells C) cartilage D) fat