Answer:
Muscle contraction is defined at the molecular level by myosin molecules bringing actin filaments together.
Explanation:
Researchers at Osaka University have created new electron cryomicroscopy images with remarkable resolution that reveal unusually substantial conformational changes in the myosin molecule during the pull.
Teens compared to older adults, sexually active adolescents 15-19 years of age and young adults 20-24 years of age are at higher risk for acquiring STIs for a combination of behavioral, biological, and cultural reasons
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