A muscle fiber generates maximum contractile force when
A) it has been stretched excessively.
B) it receives repeated action potentials from a motor neuron.
C) it has been exposed to creatine phosphate.
D) some of the myofibrils contract and then relax at the same time.
B
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At the beginning of prophase I, there are _____ chromosomes in the germ cell that will develop into a human sperm
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The __________ deliver(s) nutrient-rich blood from
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The notion that the genetic code is universal suggests a common ancestor for all living organisms Indicate whether the statement is true or false