When an action potential from a motor neuron arrives at the neuromuscular junction (NMJ), a series of events occurs that leads to muscle contraction. Which of the following events will occur last (that is, after all of the others)?
A) acetylcholine (ACh) release
B) conformational change in troponin
C) depolarization of the muscle cell
D) release of Ca2+ from the sarcoplasmic reticulum
B
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____ introduce(s) new genetic combinations of
alleles into the chromosomes.
a. Independent assortment in meiosis I b. Crossing over in meiosis II c. Breeding between the dominant individuals in the population d. Breeding between the recessive individuals in the population e. More than one of these
Which of the following is abiotic?
A) a protist B) a plant C) a fungus D) a rock
Atoms with the same number of protons but with different electrical charges are...
What will be an ideal response?
When compared to other age groups, young adults have lower rates of office-based doctor visits. This is primarily because _____
A. young adults are healthier and don’t need to visit the doctor B. young adults are typically too busy to go to a doctor appointment C. young adults struggle with the transition from pediatric/adolescent care to adult care D. young adults usually get their health care from their university