1 If the black lines aren't visible on the external screen, the laptop screen may need to be replaced. 2  If the black lines are also visible on the external screen, the video card or motherboard may need to be replaced. 3  In some cases, a loose video card can cause problems with the monitor video.
1. segmentation - (embryology) the repeated division of a fertilised ovum. cleavage. embryology-the branch of biology that studies the formation and early development of living organisms. cell division, cellular division-the process in reproduction and growth by which a cell divides to form daughter cells.
Segmentation is a localized contraction of circular smooth muscles that constricts the intestine into segments. Pendular movements are alternating contraction and relaxation of the longitudinal muscles causing a portion of the small intestine to shorten and lengthen.To unlock this lesson you must be a Study.com Member.eristalsis moves food along the small intestine, but we also see two other movements within the organ. While these two movements do not push the food along the tract like peristalsis, they do mix the chyme with the digestive juices and bring particles of food into contact with the wall where they can be absorbed.