Most involuntary muscles are made up of smooth muscle. Smooth muscle lacks the striated structure of skeletal muscle and instead consists of sheets or layers of smooth muscle cells. When stimulated by ...
Prostaglandins support menstruation by tightening uterine muscles and blood vessels. However, the high prostaglandin levels around the start of your period cause cramps. Secondary dysmenorrhea: ...
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Running through parts of the brain are a dozen pairs of cranial nerves, which link the brain directly to muscles and sense ... neurons—than would a totally smooth layer of brain cells.