Check new design of our homepage! Skeletal Muscle Functions Skeletal muscle functions described in the following article will help you know more about these most abundantly found muscles in the human body.
This page is part of the section about the structure and function of different Tissue Types, which is related to the section about Histology and Cells incl.
The tissue types section is included to complete description of the knowledge of "Histology - The Cell" required by some courses in First-Level Anatomy and Physiology. To read about other tissue types see the list of on the left.
There are 3 types of muscle tissue: Skeletal muscle tissue, Cardiac muscle tissue, and Smooth muscle tissue. The structure of these muscle tissues can be described from the level of detail of the muscle fibres muscle cells through all the other muscle structures and parts of structures that bind muscle cells together enabling them to perform their functions.
The functions of muscle tissues depend on the type of muscle tissues and their locations in the body. Here is an overview of the 3 types of muscle tissues: Skeletal muscle is called "striated" because of its appearance consisting of light and dark bands visible using a light microscope.
As shown in the diagram on the righta single skeletal muscle cell is long and approximately cylindrical in shape, with many nuclei located at the edges periphery of the cell. Movement of the skeleton under concious control, including movement of limbs, fingers, toes, neck, etc.
Movement of tissues of facial expression under concious control, e. Cardiac muscle fibers are striated, branched sometimes described as Y-shapedand have a single central nucleus. These fibers are attached at their ends to adjoining fibers by thick plasma membranes called intercalated discs shown in digram on the right.
Pumping of blood through the heart: Alternate contraction and relaxation of cardiac muscle pumps De-oxygenated blood through the Right Atrium and Right Ventricle to the lungs, and Oxygenated blood through the Left Atrium and Left Ventricle to the aorta, then the rest of the body.
Unlike Skeletal and Cardiac muscle tissue, Smooth muscle is not striated. Smooth muscle fibers are small and tapered - with the ends reducing in size, in contrast to the cylindrical shape of skeletal muscle.
Each smooth muscle fiber has a single centrally located nucleus. Contractions of smooth muscle constrict i. This is particularly important in the digestive system in which the action of smooth muscle helps to move food along the gastrointestinal tract as well as breaking the food down further.
Smooth muscle also contributes to moving fluids through the body and to the elimination of indigestible matter from the gastrointestinal system. Diagram of Smooth Muscle Tissue Table comparing the 3 types of muscle tissue: Type of Muscle Tissue.It is very important to understand that skeletal muscle is composed of three very different types of fibers that have a range of biochemical and physiological characteristics.
Figure illustrates the primary functional components that constitute skeletal muscle, whereas Box describes each of these components. A whole muscle consists of three main components, each surrounded by a particular type of connective tissue that supports its function.
Start studying Skeletal Muscle: Structure and Function. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The structure of these muscle tissues can be described from the level of detail of the muscle fibres (muscle cells) through all the other muscle structures and parts of structures that bind muscle cells together enabling them to perform their functions.
In skeletal muscle, the muscle fibers are very large, multinucleated, and up to several millimeters in length. Looking at one muscle fiber, you will see that almost the entire cross section of the muscle fiber is taken up by long, cylindrical strands of contractile proteins called myofibrils.
Typically there are hundreds of these in one cross section of a muscle fiber. Skeletal Muscle Structure.
Skeletal muscle is comprised of a series of muscle fibers made of muscle cells. These muscle cells are long and multinucleated.
At the ends of each skeletal muscle a tendon connects the muscle to bone. This tendon connects directly to the epimysium, or collagenous outer covering of skeletal muscle.