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.
Sex-linked disorders. Genetic diseases or conditions caused by a mutation on the sex chromosomes. Patterns of inheritance tend to be gender-specific. Single gene disorders. Genetic diseases or conditions caused by a mutation in a single gene or DNA sequence. Also known as Mendelian, Classical and Monogenic disorders.They are usually passed from one generation to the next. Somatic cells. Non-sex cells (not ova or sperm).Somatic or sporadic mutation.he predicted course and outcome of a disease. Recessive disorders. Genetic disease or condition caused by a mutation on both genes in a pair (homozygous). The disease or condition only arises when both parents pass on a copy of the faulty gene.