What is the difference between a nerve fibre and a nerve?

A nerve fiber is a threadlike extension of a nerve cell and consists of an axon and myelin sheath (if present) in the nervous system. There are nerve fibers in the central nervous system and peripheral nervous system. A nerve fiber may be myelinated and/or unmyelinated. In the central nervous system (CNS), myelin is produced by oligodendroglia cells. Schwann cells form myelin in the peripheral nervous system (PNS). Schwann cells can also make a thin covering for an axon which does not consist of myelin (in the PNS). A peripheral nerve fiber consists of an axon, myelin sheath, Schwann cells and its endoneurium. There are no endoneurium and Schwann cells in the central nervous system.

A peripheral nerve, or simply nerve is an enclosed, cable-like bundle of peripheral axons (the long, slender projections of neurons). A nerve provides a common pathway for the electrochemical nerve impulses that are transmitted along each of the axons. Nerves are found only in the peripheral nervous system. In the central nervous system, the analogous structures are known as tracts.

There are 2 crucial ways to categorize muscle fibers: the form of myosin (quickly or slow) present, and the degree of oxidative phosphorylation that the fiber undergoes. Skeletal muscle can for this reason be broken down into 2 extensive categories: form I and form II. form I fibers look pink through presence of the oxygen binding protein myoglobin. those fibers are suited for persistence and are slow to fatigue through fact they use oxidative metabolism to generate ATP. form II fibers are white through absence of myoglobin and a reliance on glycolytic enzymes. those fibers are effectual for short bursts of velocity and potential and use the two oxidative metabolism and anaerobic metabolism finding on the particular sub-form. those fibers are swifter to fatigue. guy or woman muscle fibers are formed for the time of progression from the fusion of countless undifferentiated immature cells referred to as myoblasts into long, cylindrical, multi-nucleated cells. Differentiation into this state is mostly performed earlier start with the cells persevering with to enhance in length thereafter. Skeletal muscle shows a different banding development while considered decrease than the microscope through affiliation of cytoskeletal aspects interior the cytoplasm of the muscle fibers. The crucial cytoplasmic proteins are myosin and actin (called "thick" and "skinny" filaments, respectively) that are arranged in a repeating unit referred to as a sarcomere. The interplay of myosin and actin is in charge for muscle contraction. see wikipedia and utube "'sarcomere" for greater suited information suitable of success to you

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