Injuries or trauma to any part of the arm or shoulder, including bone fractures, joint dislocations, and muscle strains and sprains, are common causes of arm pain. Sometimes diseases that affect other organs in the body, like peripheral vascular disease or arthritis, can be the cause of pain in the arm.
/sporÂ·uÂ·laÂ·tion/ (sporâ³u-laÂ´shun) formation of spores. sporulation. 1 a type of reproduction that occurs in fungi, algae, and protozoa and involves the formation of spores by the spontaneous division of a cell into four or more daughter cells, each of which contains a part of the original nucleus.
A spore is a reproductive cell that can develop into a new individual without uniting with another reproductive cell. Spores are distinguished from gametes, which are reproductive cells that must unite with gametes of the opposite sex in order to form a new organism. Thus spores are agents of asexual reproduction, whereas gametes are agents of sexual reproduction.