1. Explain how muscles work in pairs in moving limbs.
· As we learn in this reading and in class. A muscle is attached to the skeleton by tendons that are dense connective tissues. But bones are just able to pull and not push. That is why muscles must work in pairs because this way the bone has the ability to move freely and not in only one direction. As one muscle contracts the other relaxes. An example that shows this work of the muscles is in the arm when you are making a movement the triceps contracted, and the biceps relax.
2. Identify the structures that make up a skeletal muscle. Include these terms: muscle fiber, fascicle, myofibrils, actin, myosin, sarcomere.
· The structure that makes up the skeletal muscle is extremely complex, because of the big amount of part that a really small muscle can contain inside. The skeletal muscle is made of bundles of muscle fibers; in each of these fibers we contain a great amount of nuclei. In each of the nuclei they are myofibril that also have repeating units known as sarcomeres. Finally in each of these myofibrils you find to types of filaments one is thick (myosin) and the other thin (actin). Which change the position depending if the muscle is relaxed or contracted.
3. Identify at least 3 organ systems involved in a handshake. Describe WHAT each system contributes to the handshake.
· When a handshake occurs are body usually use many organs systems to help. Some examples of the organs you use are; first you always use the nervous system because the brain is the one in charge of making the decision to handshake, and it send the message along the nerves to make the movement. Also we use a skeletal system because is the one in charge of giving the shape to the 27bones in your hand, and it allows the position in which you change your hand. At last we use the integumentary system, which is the skin, and is in charge of covering and protecting the body of infection, excessive heat or cold and drying out.
4. Explain how actin and myosin interact as a muscle cell contracts.
· Actin and myosin interact as muscle cell contract. First of all the myosin head holds-on to fibers made up of actin that bends. This makes that the actins are pulled together and are put on the center of the sarcomere. After this happens, the myosin head leaves the actin fiber and connect to other parts of the fiber and makes the process of pulling again. When the filament is totally pulled it creates contraction.
The answers are very well done and easy to understand. I especially liked how in question number one you used and example; that allows the reader to understand more. One thing you can improve is in question 2, you can explain more what an actin and myosin is, and in question 4 the use of ATP for muscle contracting.
ReplyDeleteMica! wee done with your responses, i like how you tell us step by step the use of the organ systems that are involved in a handshake. You give a clear example of everything that a human does without been aware of. In the last question don't forget explaining that the energy used for the contraction of the myosin and actin is always ATP.
ReplyDeleteI think you have done very good with your responses, they are very easy to understand and you are telling us all the processes step by step. You can also use the muscles for the handshake question :) very good
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