Because of the presence of both activation and inactivation gates, voltage-gated Na+ channels can
a. be closed but capable of opening.
b. activated.
c. closed and not capable of opening.
d. all of these answers.
e. none of these answers.
D
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If the potential energy in the chemical bonds of the reactants is greater than the potential energy in the chemical bonds of the product,
A. the chemical reaction equalizes the potential energy levels. B. energy has not been gained or lost. C. energy must be supplied for the reaction to occur. D. energy is released by the reaction. E. energy is not a factor in the reaction.
Which type of cell carries out bone formation?
A) ossicles B) osteocytes C) osteons D) osteoblasts E) osteoclasts
What is menarche?
A. Age at first ejaculation B. Age at which a woman gives birth to her first child C. Age at which breasts begin to develop D. Age of last menstruation E. Age of first menstruation
During development, the midgut artery appears to be markedly narrowed at its origin. Which of the following structures is derived from the midgut and may receive inadequate blood supply?
(A) Gallbladder (B) Stomach (C) Descending colon (D) Ascending colon (E) Rectum