MAIN IDEA: Muscles contract when the nervous system causes muscle filaments to m
ID: 208974 • Letter: M
Question
MAIN IDEA: Muscles contract when the nervous system causes muscle filaments to move. Fill in the blank with the word or phrase that best completes the sentence. 4. Muscle fibers called shorten when a muscle is contracted. 5. Muscle fibers are divided into sections called Answer the following questions: 1. What shortens when a muscle is contracted? 2 Which flaman i nchres to h midi f ncomere? 3. Which filament is anchored to the Z line? 4. Where is the Z line located? In the space below, draw two diagrams: one of a relaxed sarcomere, and the second of a contra sarcomere. Label actin, myosin, Z line, M line, and sarcomere in your drawings. Relaxed Contracted 5. What happens to actin and myosin when muscles relax?Explanation / Answer
4. Straited muscle fibres contract when sacromeres shorten.
5. Sacromeres: they allow the muscles to contract
1. Sacromeres shorten when the muscles contract.
2. Myosin filament is anchored to the center of sacromere.
3. Actin filament is anchored to z line.
4. Z lines are found between adjacent sacromeres.
5. Actin and myosin are unbound when muscles relax. Calcium is lumped back into sarcoplasmic reticulum breaking the link between actin and myosin.
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