Small extensions of the muscle cell's plasma membrane that connect with myofibrils are called
a. T tubules.
b. cross-bridges.
c. sarcoplasmic reticulum.
d. neuromuscular junctions.
e. neurotransmitters.
A
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What cannot be determined from examining age pyramids of human populations?
A) the future population size B) the age structure of the population C) the success of future generations D) the fecundity of a future population
Why are eukaryotic organisms so much more diverse than prokaryotic organisms?
A. Their genomes are larger than those of prokaryotes. B. They reproduce sexually. C. They compartmentalize energy metabolism. D. All of these choices are correct.
What element is considered an essential macronutrient for plants?
a. zinc b. uranium c. iron d. nickel e. carbon
Which of the following is NOT a function of the integumentary system?
A. Regulation of body temperature B. Fluid transport C. Protection from dehydration D. Defense against pathogens E. Supporting the weight of body structures