A man recovering from testicular cancer who has lost 50% of his Leydig cells may find that he has a lower level of testosterone than before.
Answer the following statement true (T) or false (F)
True
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The Na+ and K+ channels that open and close during an action potential are voltage-gated channels
Indicate whether the statement is true or false
If the products of a chemical reaction contain less potential energy than the reactants,
A. energy has been released by the breaking of molecular bonds. B. a synthesis reaction is likely to have occurred. C. the reaction will be reversible without additional energy input. D. energy has been stored in the molecular bonds of the product. E. All of the choices are correct.
Temporal summation is used in the body to
A. increase the amount of force generated by skeletal muscle fibers. B. activate nearby skeletal muscle fibers, when a muscle fiber is under constant stimulation. C. maintain constant tension in a muscle fiber every time it contracts. D. decrease muscle contraction in muscle fibers, to prevent damage to the cells. E. accomplish all of these functions.
Which of the following bones of the skull is paired?
A. Sphenoid B. Ethmoid C. Occipital D. Vomer E. Parietal