The percentage of ________ muscle fibers changes with physical conditioning.
Fill in the blank(s) with the appropriate word(s).
intermediate
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Roughly ________ percent of the skeletal muscles are axial muscles. (Note: Be sure your answer is a numeral, e.g. "5" vs "five").
Fill in the blank(s) with the appropriate word(s).
__________ fluid prevents friction between the heart and the pericardium when the heart beats
Fill in the blank(s) with correct word
One of the major problems a premature infant may develop is respiratory distress syndrome. This occurs because in a premature infant,
A. there aren't enough red blood cells to carry oxygen. B. oxygen transport is impaired. C. the lungs are collapsed. D. surfactant isn't produced. E. there is mixing of the arterial and venous blood.
Which type of receptor is sensitive to changes in blood pH?
A) baroreceptors B) proprioceptors C) photoreceptors D) chemoreceptors E) mechanoreceptors