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Skeletal Muscle Tissue
Transcript of Skeletal Muscle Tissue
"These fasciculi consist of still smaller bundles of elongated, cylindrical muscle cells, the fibres. Each fibre is a syncytium, i.e. a cell that have many nuclei. The nuclei are oval in shaped and are found at the periphery of the cell, just beneath the thin, elastic membrane (sarcolemma)."
How does it work?
"During the contraction of the skeletal muscle tissue, the actin filaments slide inwards betweeen the myosin filaments. Mitochondria provide the energy for this to take place. This action causes a shortening of the sacromeres (Z lines move closer together), which in turn causes the whole muscle fibre to contract. This can bring out a shortening of the entire muscle such as the biceps,depending on the number of muscle fibres that were stimulated. The contraction of skeletal muscle tissue is very quick and forceful."
What is Skeletal Muscle Tissue?
"Skeletal muscle is the most abundant tissue in the vertebrate body.These muscles are attached to and bring about the movement of the various bones of the skeleton, hence the name skeletal muscles."
-Muscle tissue work together, they use eachother to coordinate the movement of ones limbs, facial muscles, eyeballs and many others in the human body.
-Skeletal muscles are also directly used in the breathing process.
"Muscle Tissues." <i>University of the Western Cape</i>. Web. 22 Sept. 2014. <http://www.botany.uwc.ac.za/sci_ed/grade10/mammal/muscle.htm>.
Skeletal Muscle Tissue
Inside the Tissue (cont.)
"The sarcoplasm also has many alternating light and dark bands, giving the fibre a striped or striated appearance. With the aid of an electron microscope it can be seen that each muscle fibre is made up of many smaller units, the myofibrils."
What is it?
Skeletal muscle tissue is part of a general group called muscle tissue. There are three main types of muscle tissue.
-skeletal muscle tissue
-smooth muscle tissue
-cardiac muscle tissue
They all do the same thing, but have different jobs thru out the body. Muscle tissue has the ability to bring about movement in the body as well as contract and relax again on their own.
Where is it located?
"The whole muscle, such as the biceps, is enclosed in a sheath of connective tissue, the epimysium. This sheath folds inwards into the substance of the muscle to surround a large number of smaller bundles, the fasciculi."
"Each miyofibril consists of small protein filaments, known as actin and myosin filaments. The myosin filaments are slightly thicker and make up the dark band (A band). The actin filaments make up the light bands (I bands) which are situated on either side of the dark band. The actin filaments are attached to the Z-line.This arrangment of actin and myosin filaments is known as a sacromere."