The Muscular System Of The Human

Skeletal Muscle Structure.The cells of skeletal muscles are long fiber-like structures. They contain many nuclei and are subdivided into smaller structures called myofibrils. Myofibrils are composed of 2 kinds of myofilaments. The thin filaments are made of 2 strands of the protein actin and one strand of a regulatory protein coiled together. The thick filaments are staggered arrays of myosin molecules.

system is to provide movement for the body. The muscular system consist of three different

Introduction: According to the “Human Physiology Laboratory Manual “,BIOL 282 ,page 31 , the reason of performing this experiment is to learn how the muscle contraction occurs based on the molecular level and what kind of factors are involved .As a matter of fact, skeletal muscles contain a lot of nuclei because of the cell fusion while being developed and are made of cylindrical cells that have myofibrils. The myofibrils contain sarcomeres and the

Muscle fibres, as shown in Diagram 1, consist of myofibrils, which contain the proteins, actin and myosin, in specific arrangements . The diagram illustrates how a muscle is made up of many fascicles, which in turn are made up of many endomysiums, and within them, many muscle fibres. Each muscle fibre is made up of many myofibrils that consist of sarcomeres bound end on end . Actin is a thin filament, about 7nm in diameter, and myosin is a thick filament, about 15nm in diameter , both of which reside in the sarcomere. They are held together by transverse bands known as Z lines . Diagram 2 shows actin and myosin filaments within a sarcomere, and the Z lines that connect them.

Muscles in human body is like the motor which supports or assist the bones at the joints to move and work. When the muscle pulls it moves the bones at particular joints, which establish the joints to move about.

Martini, F. H., Nath, J. L., and Bartholomew, E. F. “Muscle Tissue.” Anatomy & Physiology. 9th

Skeletal muscles allow the bones to move; smooth muscles aid in digestion; cardiac muscles pump blood throughout the body.

Myofibrils are made up of long proteins that include myosin, titin, and actin while other proteins bind them together. These proteins are arranged into thin and thick filaments that are repetitive along the myofibril in sectors known as sarcomeres. The sliding of actin and myosin filaments along each other is when the muscle is contracting. Dark A-bands and light I-bands reappear along myofibrils. The alignment of myofibrils causes an appearance of the cell to look banded or striated. A myofibril is made up of lots of sarcomeres. As the sarcomeres contract individually the muscle cells and myofibrils shorten in length. The longitudinal section of skeletal muscle exhibits a unique pattern of alternating light and dark bands. The dark staining, A-bands possess a pale region in the middle called the H-zone. In the middle of the H-zone the M-line is found, that displays filamentous structures that can join the thick filaments. The light-staining bands also known as I-bands are divided by thin Z-line. These striated patterns appear because of the presence of myofibrils in the sarcoplasm (IUPUI, 2016).

The muscular system has many functions. There are 5 main functions. Firstly, it allows us to balance via proprio receptors. In terms of balance, not only do you rely on the two sensory organs in your inner ear but also receptors in your muscles and tendons help your body to balance. The receptors in your muscles and tendons are called proprio receptors, these proprio receptors detect how stretched your joints, tendons and muscles are.

When a muscle contracts, myosin heads in thick filaments bind to actin in thin filaments and pulls the thin filament, shortening the length of the muscle fiber. However, without Ca++ when troponin binds to actin, the tropomyosin moves into a position that

Chapter 13 talks about the muscular system and the way that it is works together with the skeletal system and other systems in our body. It also explains the ways our muscles contract and move and what processes are going on in within our muscles when we work each one of them. The chapter also talks about disorders that can happen within our muscles and the way they affect our life. What I found most surprising in the chapter was reading the box that talked about botox ad wrinkles. It was shocking to read that the toxin used for botox is one of the most lethal substances and yet people are voluntarily putting it in their body. Another thing that surprised me to know was that the same substance had also been approved to treat migraine headaches.

Your muscles need protein, nutrients, and oxygen to move and work. Then the circulatory system carries those essential particles to your muscles from the digestive and respiratory systems. That is when your circulatory system carries the leftover waste back to the original systems to be discharged from your body. Your nervous

    Have you ever wondered how the skeletal and muscular systems interact with each other? If so, read on for the following paragraph describes both systems and their interactions.

The skeletal system contains all the bones of the body including the joints where they attach to each other. The skeleton protects all the internal organs, provides a framework so the human body can keep upright and move, stores minerals, which the body needs to function properly, and produces blood cells. The muscles in the skeletal system provide movement and without them any bump to the organs could cause sever damage.

Have you ever thought about how humans would be without bones? They would not be able to function the way that they do now if it did not have bones. The skeletal system is a highly important system in the human body, it functions as support, protection, and creation of red blood cells. This system is composed of bones and joints, an average adult contains 206 bone and an average child contains 270 bones because as a person grows the bones fuse together to create a single bone. The skeletal system is divided in to two major category: the axial skeleton and the appendicular skeleton. The axial skeleton has 80 bones in the midline axis which contains the bones of the head and the trunk; while the appendicular axis has 126 bones which include the bones from the limbs, pectoral and pelvic regions. There are only a few select bones that are mainly affected by the Paget disease these include the pelvis and the tibia which belong to the appendicular axis; however, other bones that could be affected are the femur, spine, skull, clavicle, and fibula.