The shaft of a flagellum contains _____________ microtubule doublets around its periphery
A. 9
B. 2 + 9
C. 2+7
D. 7
E. 2
A
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Which of the following statements concerning pulmonary surfactant is incorrect?
a. pulmonary surfactant is secreted by Type II alveolar cells. b. pulmonary surfactant is deficient in newborn respiratory distress syndrome. c. pulmonary surfactant promotes elastic recoil of the lungs. d. the cohesive force between a water molecule and an adjacent pulmonary surfactant molecule is much lower than the cohesive force between two adjacent water molecules. e. pulmonary surfactant reduces surface tension.
The effect of the neurotransmitter on the muscle cell membrane is to temporarily modify its permeability of ions such as Na+ and K+
Indicate whether the statement is true or false
Identify the statement concerning general functional characteristics of muscle that is true.
A. Muscle tissue shortens passively but lengthens forcefully. B. Muscle tissue can get shorter, but cannot get longer. C. Muscle tissue shortens forcefully but lengthens passively. D. Muscle tissue can get longer, but cannot get shorter. E. None of these statements are true.
Which of the following terms encompasses all of the other ones?
A) Oxidation reactions B) Metabolism C) Anabolism D) Reduction reactions E) Catabolism