What is the smallest functional unit of skeletal muscle? Explain why it is the smallest functional...
What is the smallest functional unit of skeletal
muscle? Explain why it is the smallest
functional unit and what happens to it during muscle
contraction.
Homework Answers
- The sarcomere is the smallest contractile unit of skeletal muscles.
- it is the smallest functional unit because it is the smallest functional part of Myofibrils. Ans myofibrils itself is the smallest unit of skelatal muscle system.
- During muscle contraction within the sarcomere, myosin slides along actin to contract the muscle fiber in a process that requires ATP.
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What is the smallest functional unit of skeletal
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7. Electrical and contractile events of muscle are related, and their timing is sequential. Explain these pictures - what happens during the lag? Twitch Omv- action potential Skeletal -90 mV contraction cardiac - relaxation phase contraction phase delay Action potential teau phase Muscle contraction Muscle contraction MV or muscle contraction MV or musde contraction 100 300 100 200 200 Time (ma) Time (ma)
Question 50 1 pts What happens during a tetanic contraction in skeletal muscle? Twitches sum together, creating a strong contraction Action potentials sum together, leading to a strong contraction The muscle is stretched and reflexively contracts strongly Ca2+ influxes in SR, which leads to a strong contraction Question 49 1 pts In smooth muscle, phosphorylation of leads to contraction. Dihydropyradine Receptor Tropomyosin Myosin light chain Calmodulin O Troponin
Question Completion Status: QUESTION 2 Different in smooth muscle compared to skeletal muscle a. Sarcoplasm reticulum is missing b .calcium is not required c. Sarcoplasm reticulum is less developed d. sarcolemma is missing QUESTION 3 Magnesium plays key role in deep tissue contraction, answer true false for this question a. true b. false c.not sure de silly question QUESTION 4 Clear evidence of sarcomere (when looking under microscope) in a. Cardiac muscle smooth muscle skeletal muscled . A and QUESTIONS...
EXERCISE 10 REVIEW QUESTIONS Introduction to Skeletal Muscle 1. What is the structural basis for the alternating light and dark striations in skeletal muscle fibers! 2. Describe the band(s). line(s), androne() that are found in a single sarcomer QUESTIONS 3-9: Identify the labeled structures in the following diagram. EXERCISE 10 Introduction to Skeletal Muscle 16 w the two figures below and compare the condition of the sarcomere at rest and after contraction Sarcomere at rest i band A band (b)...
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