Concept Check Juan Diego Arregui
1. Explain how muscles work in pairs in moving limbs.
All muscles have to work in pairs, as one contracts the other relaxes. Tendons don’t allow muscles to go back to their original position it is fundamental that these work in pairs.
2.Identify the structures that make up skeletal muscle
1 Muscle fiber: contains nuclei and is a long cylindrical muscle.
2 Myofibrils: are found inside the muscle fibers
Sarcomere: is the unit that contracts in the muscle and has two kinds of filaments
3 Myosin: composed of proteins and have bump like projections. Thick
4 Acting: have a twisted structure and are composed of protein. Thin
3. Identify at least three organ systems involved in a handshake. Describe what each system contributes to a handshake.
The 3 systems involved are muscular, nervous and skeletal.
1 Your eyes send signal to your brain.
2 Your brain sends signals to all the muscles
3 Finally they start shaking, this includes the contradiction of many skeletal systems, your shoulder, back, arms, etc.
4. Explain how actin and myosin interact as a muscle cell contracts.
Myosin heads attach to the actin, here they get aligned together in the center that is called the sacromere. This causes the muscle to contract. When the muscle relaxes, means that the myosin release from the actin because of ATP.
I thought that you did a good job but i also thought that you should have included that muscles can only pull not push. On the second question including example would have been useful. On the thrid question you could have explain a little bit more about the brain.
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