A muscle fiber contains many myofibrils, which are cylinders of muscle proteins. These proteins allow a muscle cell to contract. Myofibrils contain two types of filaments that run along the long axis of the fiber, and these filaments are arranged in hexagonal patterns. There are thick and thin filaments.hese proteins allow a muscle cell to contract. Myofibrils contain two types of filaments that run along the long axis of the fiber, and these filaments are arranged in hexagonal patterns. There are thick and thin filaments.
Cocklebur (Xanthium strumarium L.) is a large, annual broad-leaved weed with an erect, branched stem and broadly triangular leaves (Figure 1). The stem is rough-hairy, spotted with purple and up to 1.5 m high. The leaves are alternate on the stem, with toothed or lobed margins and rough-hairy surfaces.
cockle-common edible, burrowing European bivalve mollusk that has a strong, rounded shell with radiating ribs. bivalve, lamellibranch, pelecypod-marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together.t warmed the cockles of my geniality and put a fairer face on the truly fair face of the sea. John Barleycorn by London, Jack View in context. , and it warmed the cockles of her heart that the members appreciated her efforts so sincerely.