Infrapatellar bursitis occurs when one or both of the bursa sacs inside the knee become irritated and inflamed resulting in swelling and knee pain. A bursa is a sac of synovial fluid, rich in protein and collagen.
In biology, motility is the ability of organisms and fluid to move or get around. A microbiologist might test and compare the motility of various single-celled organisms. An easy way to remember that motility means the ability to move without help is the mot- at the root of the word. It's the same root that's found in motor, which is, of course, the engine that drives a car. If you've got good motility then your motor is working.
Infertility is the inability to become pregnant after twelve months of regular, unprotected intercourse or the inability to carry a pregnancy to live birth. For women age 35 and older, testing for causes of infertility is recommended after six months of trying to become pregnant without success. Infertility affects both men and women, leading to difficulty conceiving for about one in eight couples.