For gas exchange to be efficient, the respiratory membrane must be ________.
A) at least 3 micrometers thick
B) 0.5 to 1 micrometer thick
C) between 5 and 6 micrometers thick
D) The thickness of the respiratory membrane is not important in the efficiency of gas exchange.
B) 0.5 to 1 micrometer thick
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The peroneus brevis and longus muscles are in the ____________________ compartment of muscles that move the foot and toe.
Fill in the blank(s) with the appropriate word(s).
Osteons run perpendicular to the diaphysis of a long bone.
Answer the following statement true (T) or false (F)
Which of the following is true of tight junctions?
A. They contain channels of diffusion of solutes from one cell to the next. B. They seal off intercellular space and prevent substances from passing between cells. C. They are formed by connexons. D. They are patch-like connections that are abundant in the epidermis and serve to keep cells from pulling apart. E. They are patches that are formed when J-shaped proteins protrude toward the plasma membrane from the cytoskeleton.
The first means by which ATP is produced at the onset of contractile activity is
a. transfer of energy and phosphate from creatine phosphate to ADP b. oxidative phosphorylation c. glycolysis d. degradation of myoglobin e. none of these