With twitch summation, the muscle fiber is stimulated so rapidly that it does not have an opportunity to return to resting potential between stimuli
Indicate whether the statement is true or false
F
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Sex _________ (estrogen, testosterone) stimulate osteoblasts and promote the growth of long bones, especially in adolescence.
Fill in the blank(s) with the appropriate word(s).
The part of the nervous system that is located outside the brain and spinal cord is called the ________ system.
A. endocrine B. central nervous C. sensory D. peripheral nervous
Which of the following appears to exert the most direct influence over autonomic functions?
A) reticular formation B) hypothalamus C) midbrain D) medulla oblongata
A molecule is
A. an alteration in the three-dimensional structure of a protein. B. a substance that conducts electricity when placed in solution. C. a combination of atoms held together by chemical bonds. D. a negatively charged ion. E. a positively charged ion.