A steady, low-level contraction of a muscle is referred to as
a. tetanus.
b. treppe.
c. spasm.
d. tone.
e. fatigue.
D
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Four of the five answers listed below are characteristic reactions of the complement system to
invaders. Select the exception. a. causes an amplifying cascade of reactions to invaders b. triggers the secretion of histamines c. causes invading cells to lyse d. enhances the recognition of invaders by phagocytes e. creates gradients that attract phagocytes
The logistic growth rate of a population is best represented by the equation
a) N[(K-N)/K] b) rN[(K-N)/K] c) [(K-N)/K] d) rN(K-N) e) r[(K-N)/K]
In aquatic ecosystems one of the major factors that determines the carrying capacity is the
A. amount of nutrients in the water. B. amount of competition among different species. C. quantity of plants in the ecosystem. D. natality.
Transport of salts against their concentration gradients is energetically expensive.
Answer the following statement true (T) or false (F)