Triclosan in some toothpastes, soaps, or hand sanitizers impairs muscle activity, including the heart's ability to contract. Electrical stimulation of isolated muscle fibers under experimental conditions evokes a muscle contraction, a phenomenon known as “excitation-contraction coupling,” the fundamental basis of any muscle movement, including heartbeats. Normal communication between two proteins that function as calcium channels was impaired, causing skeletal and cardiac muscle failure.
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Female Infertility Infertility is a condition of the reproductive system that impairs the ability to achieve pregnancy. Primary infertility is the inability to conceive a child after regular intercourse for at least 1 year. Secondary infertility occurs in couples who have previously been pregnant at least once, but are unable to achieve another pregnancy.