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.
Question: My side of my house is being infested by ârolly-polliesâ. Is there anything you can do to stop them from coming into my house? ANSWER Sowbugs or pillbugs (rolly pollys) are not actually insects. They are related to crayfish. There is a slight difference between sowbugs and pillbugs: sowbugs cannot roll up into a ball when disturbed, and pillbugs can.