Which of the following factors can predispose runners to stress fractures?
A. increased training duration or intensity without allowing time for bone remodeling
B. abrupt changes in running surface
C. both A and B
D. runners are not predisposed to stress fractures
C. both A and B
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The fetus receives antibodies from the mother, which last several months after birth. This is an example of ________.
A. natural passive immunity B. natural active immunity C. artificial active immunity D. artificial passive immunity
Answer the following statements true (T) or false (F)
1. A reduction in capillary blood pressure would allow more blood to be pushed into the interstitial fluid. 2. A reduction in the protein concentration in the plasma would allow more blood to remain in the interstitial fluid. 3. An increase in the protein concentration in the plasma would allow more blood to remain in the interstitial fluid. 4. A decrease in capillary blood pressure or an increase in the plasma protein concentration would have about the same effect on the interstitial fluid. 5. An increase in capillary blood pressure or a decrease in the plasma protein concentration would have about the same effect on the interstitial fluid.
Which is not true of voltage-gated sodium channels?
A) They have both an activation gate and an inactivation gate that work independent of each other. B) They open and close in response to changes in the membrane potential. C) They are found on excitable membranes. D) They have both an activation gate and an inactivation gate that work dependent of each other. E) None of these is false.
Each thin filament consists of
A) two protein strands coiled helically around each other. B) chains of myosin molecules. C) six molecules in a rod-like structure. D) a rod-shaped structure with "heads" projecting from each end. E) a double strand of myosin molecules.