Each muscle is surrounded by a connective tissue sheath called the epimysium. ... Within the fasciculus, each individual muscle cell, called a muscle fiber, is surrounded by connective tissue called the endomysium. Skeletal muscle cells (fibers), like other body cells, are soft and fragile.
They are there because people believe they are from not enough sleep but some people get them from genes. Genes are things you get from your parents.
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A bacterial STDs are caused by bacteria that enters the body either through skin contact or body fluids. a viral std is a sexually transmitted infection that is caused by a virus. unlike bacteria viruses these are not living organisms and need a host cell in order to replicate and survive. some of the most common vital stds are HPV, herpes, hepatitis and HIV these cannot be cured however although a virus will remain in the body for life symptoms of the virus that might be not be present at all times.
