The muscle fiber relaxes and the entire sarcomere lengthens. This lengthens service life, improves operating behavior, and smooths work flows. Because the arches flatten, the foot lengthens and widens as it takes weight. Pulling the entire braid lengthens and narrows it. Immersing flowers in glycerol or polyethylene glycol also lengthens lifespan. The temporary slowing-down of their metabolisms also lengthens the animals' lifespans. The step lengthens as the pregnancy progresses, due to weight gain and changes in posture. During early foregut development, the esophagus lengthens considerably, reaching its proportional postnatal size. Telomerase is a reverse transcriptase that lengthens the ends of linear chromosomes. To strengthen muscle the external force must exceed the muscle while it lengthens. Line extension occurs when the company lengthens its product line beyond its current range. Typically, this lengthens the game considerably. The woomera effectively lengthens the thrower's arm, greatly increasing the velocity of the spear. When word-final or preceding another consonant, it lengthens the preceding vowel. This effectively lengthens the intake manifold run.