1. Explain how muscles work in pairs in moving limbs.
Muscle are attached to bones by tendons, this way the muscles can move the bone. If there would be only one muscle moving a bone you could only to move that bone once and only in one direction, that is because muscles are only able to pull. Each bone has a pair to be able to make the bone move in the opposite direction. As one of the muscles contracts the other one relaxes and the other way around.
2. Identify the structures that make up a skeletal muscle.
Each muscle is made of bundles with muscle fibers, which are long cells with multiple nuclei. each muscle fiber is formed by various myofibrils, which have alternating dark and light areas. Myofibrils are made of repeating units of sarcomeres, which are the units that contract. Sarcomeres have two types of filaments thick and thin. The thin filaments are made of actin proteins and the thick filaments are made of myosin. Myosin also has myosin heads.
3. Identify at least three organ systems involved in a handshake. Describe what each system contributes to the handshake.
During a handshake you use many of the organ systems. You use muscles to move your hand. You use bones which give your hand the position in which you are holding your hand. You also use your nervous system because you feel the hand of the other person in your skin.
4. Explain how actin and myosin interact as a muscle cell contracts.
Myosin heads attaches to an actin filament and bends, pulling the actin closer to the center of the sarcomere. Then the myosin head releases the actin and attaches itself in another part of the acting and keeps pulling it until the actin filament is fully contracted. This process happens simultaneously in all the myofibrils of the muscle and make the whole muscle contract.
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ReplyDeleteAlicia; I think that your concept check really helps understand what is the role of muscles and systems in the hand. Also good job developing a paragraph with all the vocab you needed, one thing I will say to improve could be question 4 you should explain more the function of the ATP involved in the process so that we can understand were does the energy to contracts come from
ReplyDeleteAlicia helped me figurate what was the answer to question # 4 because after reading the question over and over again. I went to see if there was any homework posted or comments. So I looked at her answer for # 4 and I understood the question better. But I was still not able to fully answer the question. Then I went back to the reading to try to find the answer, and I found it. The only thing that I think Alicia lacked a little bit in this question was to be more clear in What is ATP and what´s its function. Otherwise is perfect.
ReplyDeleteATP then binds to each myosin head, releasing it from the thin filament. The myosin head is now free to attach at a new spot and further pull the thin filament along.
Ali; I read your blog and it was really good the information you put about how muscles work in pair, there you help me a lot to understand how when you are making a movement you need of two muscles to make it because this way as one contacts the other relax letting are body move in more than one direction. Thank you a lot Ali for your help in how muscles work!
ReplyDeleteThe answers were really well answered.They helped me answer question number 4, since I wasn`t sure how actin and myosin helped the muscle contract. The only thing missing would be to explain how ATP attaches to the myosin releasing it from the actin.
ReplyDeleteAli!! you helped me a lot to figure out some things I didnt understand from the reading. What you are missing is what happens to the myosin and the actin when they are separate
ReplyDelete