Blood is approximately ________% plasma by volume.
Fill in the blank(s) with the appropriate word(s).
55
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Fast-oxidative (type IIa) fibers
a. contain very few mitochondria b. can be converted into fast-glycolytic fibers by regular resistance activities c. are most abundant in muscles specialized for maintaining low-intensity contractions for long periods of time without fatigue d. have characteristics b and c e. have none of the above characteristics
Cells of the central nervous system that are in direct contact with cerebrospinal fluid are:
a. astrocytes b. ependymal c. oligodendrocytes d. microglia cells
To initiate a cardiac muscle cell contraction, calcium
A. binds to calmodulin. B. binds to troponin. C. binds to actin. D. binds to the Z-disc. E. binds to tropomyosin.
Which of the following is not formed by the vagus nerve?
A. Cardiac plexus B. Pulmonary plexus C. Esophageal plexus D. Hypogastric plexus E. Anterior and posterior vagal trunks