Which of the following sequences is in the correct order for the cyclic process by which a myosin head generates force on an actin filament for muscle contraction?
A) power stroke, crossbridge formation, crossbridge dissociation, cocking of myosin head
B) crossbridge formation, power stroke, crossbridge dissociation, cocking of myosin head
C) crossbridge formation, cocking of myosin head, power stroke, crossbridge dissociation
D) crossbridge formation, crossbridge dissociation, cocking of myosin head, power stroke
E) crossbridge formation, power stroke, crossbridge dissociation, power stroke, cocking of myosin head
Answer: B
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According to evidence from ice layers from the Antarctic, atmospheric carbon dioxide levels have been rising
since ____.
a. the dinosaurs went extinct b. about 10,000 years ago c. the industrial revolution began d. the 1970s
e. human evolved 200,000 years agoIn the skin, blood vessels are found in the ________.
A. stratum corneum B. stratum basale C. dermis and subcutaneous layers D. dermis E. subcutaneous layer
Which is FALSE concerning the reticular formation:
-It is a widespread system of neurons and axons in the brainstem that extends from the medulla oblongata to the thalamus. -The reticular activating system continues from this point (the thalamus). -stimulation produces generalized cortical activation (wakefulness). -stimulation produces generalized cortical depression (sleepiness).
Metabolic pathways that regenerate their starting point are called ________ pathways.
A. cyclic B. linear C. convergent D. divergent E. bidirectional