What are the names of the protein filaments that slide across each other durning
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Question
What are the names of the protein filaments that slide across each other durning muscle contractions?
What are the names of the protein filaments that slide across each other durning muscle contractions?
What are the names of the protein filaments that slide across each other durning muscle contractions? 11. Does contraction of the tr 12. What antagonistic pair of muscles causes adduction and abduction of the thigh? 13. What are the names of the protein filaments that slide across each other during muscle brachii result in extension or flexion of the forearm? contractions? m 14. What molecule supplies the energy needed for muscle contractions? Thought Questions 15. Bone marrow transplants are used to treat a plastic anemia (bone marrow failure) and leukemia. What is the goal of transplanting bone marrow into someone with either disease? 16. What bones/areas of bones would a forensic anthropologist pay special attention to if he/she was trying to determine the age and gender of an unidentified person to whom the set of bones belonged? 17. Why would a potassium (K+) deficiency cause muscle weakness and fatigue?
Explanation / Answer
Skeletal muscle is composed of muscle fibers which have smaller units called myofibrils. There are three types of proteins make up each myofibril; they are contractile, regulatory and structural proteins.
By contractile proteins, we mean actin (thin filament) and myosin (thick filament). Each actin filament is composed of two helical “F” actin (filamentous actin) and each ‘F’ actin is made up of multiple units of ‘G’ actin. Along with the ‘F’ actin, two filaments of regulatory proteins tropomyosin and troponin at regular intervals are present. During muscle relaxation, troponin covers the binding sites for myosin on actin filaments
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