In this unit, we learned about the muscular system, synovial joint movements and also how the muscles really worked. The whole point of muscles are to move bones and fluid, maintain posture and body position, stabilize joints, and generates heat. Muscles also have properties like the ability to contract, extend, be elastic and get excited (receive and respond to stimuli) that allow the functions mentioned above to happen. Muscles are classified into prime mover, antagonist, synergist, and fixators. Prime movers cause the desired action, the antagonist relaxes when the prime mover contracts. Synergist helps the prime mover and fixators stabilize the origin of the prime mover. The naming of a muscle depends on the direction of fibers, size, shape, action, location, and # of attachments. We also learned about some of the muscles located throughout the body and what they allow the body to do.
There are many types of synovial joint movements but the main ones are gliding, angular, rotation and special movements. The joints that allow such movements to happen are planar, hinge, pivot, condyloid, saddle and ball and socket.
Muscles are composed of thousands of bundles of muscle fibers. Each fiber contains many myofibrils and within a myofibril is composed of many sarcomeres lined up next to each other. Myofibrils are what make muscle contractions possible. Sarcomeres are composed of 2 protein filaments actin (thin) and myosin (thick). When the muscle contracts, the myosin and actin filaments slide past each other and cause the muscle to shorten.
We also learned about 3 different types of muscle fibers. Slow Twitch Fibers are highly dependent on oxygen, slow to fatigue and is best suited for long durations like a marathon. Fast Twitch fibers are generally fast to fatigue, rely on glucose and are good for short bursts of activity like sprinting. Genetics and exercise can influence the ratio in the amounts of each fiber type but it mostly depends on genetics.
My New Year Goals have been going pretty smooth but it has not been easy. Senioritis is a real thing and it is such a struggle to find the energy to even do homework. I have definitely spent excess time doing unnecessary things but my grades have maintained pretty well throughout the whole semester. With my exercise routine, I have definitely tried to fit in more runs here and there but with the semester almost ending, I definitely have more time to exercise.
Muscles are composed of thousands of bundles of muscle fibers. Each fiber contains many myofibrils and within a myofibril is composed of many sarcomeres lined up next to each other. Myofibrils are what make muscle contractions possible. Sarcomeres are composed of 2 protein filaments actin (thin) and myosin (thick). When the muscle contracts, the myosin and actin filaments slide past each other and cause the muscle to shorten.
We also learned about 3 different types of muscle fibers. Slow Twitch Fibers are highly dependent on oxygen, slow to fatigue and is best suited for long durations like a marathon. Fast Twitch fibers are generally fast to fatigue, rely on glucose and are good for short bursts of activity like sprinting. Genetics and exercise can influence the ratio in the amounts of each fiber type but it mostly depends on genetics.
My New Year Goals have been going pretty smooth but it has not been easy. Senioritis is a real thing and it is such a struggle to find the energy to even do homework. I have definitely spent excess time doing unnecessary things but my grades have maintained pretty well throughout the whole semester. With my exercise routine, I have definitely tried to fit in more runs here and there but with the semester almost ending, I definitely have more time to exercise.
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