10. Review the two figures below and and after contraction compare the condition
ID: 3510541 • Letter: 1
Question
10. Review the two figures below and and after contraction compare the condition of the sarcomere at rest (a) Sarcomere at rest (b) Sarcomere after contraction A band I band A band Z line H band Z line H band Z line a. Which band(s) change in length during contraction? b. Which band(s) do not change in length during contraction? 11. Fill in the blank boxes in the concept map at right by using Excitation-contraction coupling the terms in the list below A a neuromunscular junction gmaptic vesicles nelease T tubules . Acetyilcholine . Cisternae Sodium ions . Sarcoplasm which binds to neceptons on the motor end plate and initiaties an infx of 12. Describe the role that each of the following has in the contraction of a muscle fiber according to the sliding filament theory a. The power stroke An action potential spreads along the sarcolemma and causing the release of calcium ions from the b. Calcium ions sarcoplasmic reticulum and c. Troponin-tropomyosin complex EXERCISE 10 Introduction to Skeletal Muscle
Explanation / Answer
Answer 10 a) H band decreased in length during contraction.
I band increased in length during contraction
B) A band did not change during contraction
Answer 11)
At a neuromuscular junction synaptic vesicles release acetylcholine which binds to the receptor on the motor end plate and initiates an influx of sodium ion. An action potential spreads along ththe sarcolemma and T tubules causing the release of calcium ions from the sarcoplasmic reticulum and cisternae
Answer12)
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