The contraction produced can be described as a twitch, summation, or tetanus, depending on the frequency of action potentials. In skeletal muscles, muscle tension is at its greatest when the muscle is stretched to an intermediate length as described by the length-tension relationship. Smooth and cardiac muscle contractions are myogenic and can be modulated by the autonomic nervous system.
sex-linked disorder - any disease or abnormality that is determined by the sex hormones; hemophilia is determined by a gene defect on an X chromosome. bleeder's disease, haemophilia, hemophilia - congenital tendency to uncontrolled bleeding; usually affects males and is transmitted from mother to son.
Sexually Transmitted Diseases-STD. By Dr Ananya Mandal, MD. Sexually transmitted diseases (STDs) are infections that can be transmitted through sexual contact with an infected individual. These are also termed sexually transmitted infections or STIs. STDs can be transmitted during vaginal or other types of sexual intercourse including oral and anal sex.