More trip calculations. 1  driving time from Rome, Italy to Lucca, Italy. 2  reverse drive distance from Lucca, Italy to Rome, Italy. 3  halfway between Rome, Italy and Lucca, Italy. 4  hotels near Lucca, Italy. 5  flight distance from Rome, Italy to Lucca, Italy. 6  flight time from Rome, Italy to Lucca, Italy.
Surrounding each muscle fiber (cell) is a delicate external lamina composed primarily of reticular fibers. This external lamina is produced by the muscle fiber and, when observed through the light microscope, cannot be distinguished from the cell membrane of the muscle fiber, the sarcolemma.
The alveoli consist of an epithelial layer and extracellular matrix surrounded by capillaries. In some alveolar walls there are pores between alveoli called Pores of Kohn. The alveoli contain some collagen and elastic fibres.The elastic fibers allow the alveoli to stretch as they are filled with air during inhalation.he alveolar membrane is the gas-exchange surface. Carbon dioxide rich blood is pumped from the rest of the body into the alveolar blood vessels where, through diffusion, it releases its carbon dioxide and absorbs oxygen.