Economic Sanctions against Iran in Regard To Its Nuclear Weapons Program

Joints and Body Movements Essay Example

Joints and Body Movements Essay Example Joints and Body Movements Paper Joints and Body Movements Paper Purpose: What is the purpose of this exercise? In this exercise I will exam how joints function and thereby discover how they allow for movement in the body. Joints are where two bones come together. The joints hold the bones together and allow for movement of the skeleton. All of the bones, except the hyoid bone in the neck, form a joint. Joints are often categorized by the amount of motion they allow. Some of the joints are fixed, like those in the skull, allow for no movement. Other joints, like those between the vertebrae of the spine, allow for some movement. Most of the joints are free moving synovial joints. In this exercise I will exam how joints function and thereby discover how they allow for movement in the body. Are there any safety concerns associated with this exercise? If so, list what they are and what precautions should be taken. Basic lab precautions, including keep a clean workspace and washing your hand when dealing with raw poultry. In order to ensure that this occurs layout the equipment beforehand in a clean sterile environment and follow safe work practices. Exercise 1: Questions A. As you observe the skull, explain how the structure of the sutures between the cranial bones is related to the overall function of the cranium. Children’s heads needs to squeeze through the birth canal during delivery, humans during infancy have evolved with a soft skull composed of many different bony plates that meet at regions called cranial sutures. These sutures also allow the skull to grow rapidly during the first year of life, at which time the bones start to slowly fuse together. This allows the skull to continue to protect the skull during early development. B. Why are synarthroses an important component of fibrous joints? These joints are weight bearing and the joints provide stability and cushioning. Synarthrotic joint is to provide a stable union between bony surfaces. The suture and synchondrosis actually become more stable when ossification of the joint takes place. Exercise 2: Questions A. Cartilaginous joints exhibit amphiarthroses. Why is this important? Amphiarthroses provides an articulation between bony surfaces that permits limited motion and is connected by ligaments or elastic cartilage, such as that between the vertebrae. B. Structurally, how are cartilaginous joints similar? Cartilaginous joints are connected entirely by cartilage. Cartilaginous joints allow more movement between bones than a fibrous joint but less than the highly mobile synovial joint. Cartilaginous joints also form the growth regions of immature long bones and the intervertebral discs of the spinal column. Exercise 3: Questions A. Which type of synovial joint has the least amount of movement? Plane joints permit sliding or gliding movements in the plane of articular surfaces. The opposed surfaces of the bones are flat or almost fat, with movement limited by their tight joint capsules. B. Why are diarthroses important for synovial joints? Diarthrosis permits a variety of movements. All diarthrosis joints are synovial joints and the terms diarthrosis and synovial joint are considered equivalent. C. Which synovial joint is most movable? A ball and socket joint is a joint in which the distal bone is capable of motion around an indefinite number of axes, which have one common center. It enables the bone to move in a 360Â ° angle. D. What are the four structural characteristics that all synovial joints share? Synovial joints all have synovial fluid, articular cartilage, articular capsule, synovial membrane, capsular ligaments, blood vessels, and sensory nerves. Exercise 4: Questions A. Which of the body movements was the most difficult to perform? Why? Inversion which is a gliding joint and provides little movement. B. Hinge joints like the elbow and knee have limited movement. Why are these types of joints more prone to injury? Hinge joints in the elbow and knee contain a lot of anatomical structures packed into a tiny space and when challenged with heavy and constant use, it thus especially prone to injury and infection. C. When performing flexion on the arm, the biceps muscle (on the anterior of the arm) contracts. What happens to the triceps muscle (on the posterior of the arm) as this action is performed? As you perform flexion on your arm the triceps muscle relaxes. D. Both the shoulder and the hip are ball and socket joints. Why does the shoulder have a greater range of motion than the hip? The muscles and joints of the shoulder allow it to move through a remarkable range of motion, making it the most mobile joint in the human body. The shoulder can abduct, adduct rotate, be raised in front of and behind the torso and move through a full 360Â ° in the sagittal plane. Exercise 5: Observations Sketch your chicken wing: Label the bones, muscles, tendons and joints. Exercise 5: Questions A. What effect will the tearing of a tendon have on its corresponding muscle? The corresponding muscle will shrink due to the decreased activity tendon. This is because when the tendon is torn the area around the tendon will not be in very much use until the tendon is repaired which can take a good while unless professionally handled. The muscle will go back to its original size once the tendon heals and the muscle is used more. B. Why are ligaments harder to heal than tendons? Tendons heal faster than ligaments. The reason is that tendons are connected to the muscle, which will allow them to receive a larger blood flow. Ligaments are connected to bone which supplies less blood. Blood is the key -what carries nutrients in order to repair the tissue. C. Compare and contrast tendons and ligaments. Ligaments connect bone to bone and tendons connect bone to muscle. D. What is the function of fascia? It is responsible for maintaining structural, provides support and protection, and acts as a shock absorber. The function of muscle fasciae is to reduce friction to minimize the reduction of muscular force. Fasciae: a) Provide a sliding and gliding environment for muscles. b)Suspend organs in their proper place. c) Transmit movement from muscles to bones, and d) Provide a supportive and movable wrapping for nerves and blood vessels as they pass through and between muscles. [ E. What effect would the loss of articular cartilage have on a joint, its bones and their corresponding muscles? It causes the breakdown of the cartilage in joints. It also called degenerative arthritis. Cartilage is the joints cushion. It covers the ends of bones and allows free movement. If it becomes rough, frays, or wears away, bones grind against each other. As a result, the joint becomes irritated and inflamed. Sometimes the irritation causes abnormal bone growths, called spurs, which increase swelling. Conclusions Explain how skin, bones, and muscles are related to each other. Why is this relationship important to the understanding of the skeletal and muscular systems? Joints are where two bones come together. The joints hold the bones together and allow for movement of the skeleton. All of the bones, except the hyoid bone in the neck, form a joint. Joints are often categorized by the amount of motion they allow. Some of the joints are fixed, like those in the skull, allow for no movement. Other joints, like those between the vertebrae of the spine, allow for some movement. Most of the joints are free moving synovial joints.

Mass medias influence on American politics Term Paper

Mass medias influence on American politics - Term Paper Example Within this essay, this disservice will be discussed and many examples provided, proving that journalists do sometimes abuse their power when reporting political campaigns and/or political events or happenings, which can lead to misinformation and also damage of reputation for those involved in â€Å"biased† mass media reporting. One of the first examples that come to mind concerning biased reporting of politics comes from the everyday reporting of CNN and FOX television and web news. According to a journalism professor at The University of Tennessee, The Associated Press, which sets the standard for accredited news reporting throughout the United States, says that if you give one political candidate or party a certain amount of time on-air, in the newspaper or online, you must also give the opposing candidate the same amount of time and/or space. Neither of these mediums should do this; this is unfair and biased reporting, unethical on both network’s accounts. CNN is p rimarily a democratic network (Hyscience) and FOX is primarily a republican (Hyscience) network. Both of these networks work overtime bashing each other and defending the political party of their choice. For instance, during last year’s Tea Party republican rally, held in Nevada, it was reported by CNN that â€Å"dozens of people showed up† for this particular political event (Wizbang). However, other sources (Rightnetwork) provided pictures proving that thousands of people actually showed up for the Tea Party rally. CNN’s play on words, saying that â€Å"dozens† showed up, made it sound as if almost nobody showed up to support the Tea Party rally. Other sources estimated thousands of people showing up and also provided pictures of the multitude of people who showed up for the event. CNN’s bias toward the Democratic Party, in this case, was most certainly unethical, according to Associated Press standards, and these biased reports to the public mad e it look as if the Tea Party was just a minor event when in all actuality, it was a huge event. Also, MSNBC was very happy to report and broadcast a video recently of President Barack Obama being â€Å"snubbed† by Russian leaders (Youtube). This was broadcasted by MSNBC, another primarily republican network, only to make President Barack Obama look â€Å"bad†, like he isn’t being accepted by other world leaders. With the presidential re-election coming up, a conclusion could easily be drawn that MSNBC’s intentions for airing the video is to make the public consider the possible lack of respect that the rest of the world holds for President Barack Obama in hopes that he will lose the upcoming election. Reporting this in a negative light, unless it is the absolute truth, is most certainly unethical on MSNBC’s behalf. Yet another instance of unfair and biased reporting came many years ago, when former President Bill Clinton had an affair with Whiteho use intern, Monica Lewinski. Lewinski was â€Å"ragged† by the media and her character absolutely ripped apart by almost every network throughout the entire United States of America. They portrayed her as a â€Å"loose† woman, a â€Å"whore† and seemed to blame her more for the affair than they did the president himself. Of the millions of networks that portrayed her as such, only Barbara Walters, a huge name in the field of journalism,