Make a Muscle Contraction Flowchart. Show what machinery is used such as protein and structures, what...
Make a Muscle Contraction Flowchart. Show what machinery is used such as protein and structures, what steps occur, and changes in I band, H zone, A band, etc.
Homework Answers
Muscle contraction :
Muscle contraction mechanism is best explained sliding filament theory proposed by Jean Hanson and Hugh Huxley.
According to this theory contraction of muscle fibre takes place by sliding of thin filaments over /between the thick filaments.
Steps in muscle contraction:
1) Excitation of muscle : Muscle contraction starts when a stimulus from central nervous system (CNS) reaches neuromuscular junction via motor neurone.
Then neuromuscular junction release acetylcholine Which generates action potential in sarcolemma which spreads to triad system through T- tubules, then release of calcium ions from cisternae of sarcoplasmic reticulum take place.
2) Formation of cross bridges: The released calcium binds to subunit Tn-c of the troponin of thin filament. Then moving of troponin and tropomyosim complex away from active sites of actin molecules take place.
Since active site is know exposed to head of myosin ,myosin binds to active sites and form cross bridge and P1 is released.This binding is promoted by ATPase
3) Power stroke : formed cross bridge pulls actin filaments to the centre of A- band ,z-lines attached to these also pulled inward from both sides causing shortening of sarcomere - contraction of muscle take place.
4) Recovery stroke : The myosin relaxes by releasing ADP and cross bridge is broken by binding of new ATP molecule to the myosin head .again ATPase hydrolyses ATP and cycle repeats causing further sliding.
5) Relaxation of muscle: when motor Impulses stop , calcium ions are pumped back and active sites are closed and cause z- lines to revert to their original position and cause muscle relaxation.
CHANGES IN A- BAND : A- band does not shorten in length during contraction .it retains the same length but they move closer during contraction.
CHANGES IN I-Band : The I band gets reduction in size and length
CHANGES IN H- ZONE : it is central region of A zone .it contains myosin ( thick filaments) it shortens during muscle contraction due to ovelapping of actin and myosin,once muscle is totaly contracted ,H- zone dissapears.
CHANGES IN Z-LINES : These ars pulled inward during muscle contraction from both sides causing shortening of sarcomere .
Actin and myosin are the structures used in muscle
contraction : These are the contractile proteins.
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Make a Muscle Contraction Flowchart. Show what
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Can you help me answer these questions. ●I need complete answers for the whole questions. ●I...
Can you help me answer these questions.
●I need complete answers for the whole questions.
●I need accurate and correct answers,explanation and drawings
●Kindly provide clearer handwriting and drawing too.
THANK YOU SO MUCH FOR YOUR HELP.I REALLY APPRECIATE IT.
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Can you help me answer these questions.
●I need complete answers for the whole questions.
●I need accurate and correct answers,explanation and drawings
●Kindly provide clearer handwriting and drawing too.
THANK YOU SO MUCH FOR YOUR HELP.I REALLY APPRECIATE IT.
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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)...
Can you help me answer these questions.
●I need complete answers for the whole questions.
●I need accurate and correct answers,explanation and drawings
●Kindly provide clearer handwriting and drawing too.
THANK YOU SO MUCH FOR YOUR HELP.I REALLY APPRECIATE IT.
b1)Explain with the aid of diagram the process of photomorphogenesis in plant (Smarks) 2)Recognize the common problems that occur in freshwater fish and the solutions to these problems. (Smarks) 3)Illustrate the difference between the circulatory system of a frog and...
Can you help me answer these questions.
●I need complete answers for the whole questions.
●I need accurate and correct answers,explanation and drawings
●Kindly provide clearer handwriting and drawing too.
THANK YOU SO MUCH FOR YOUR HELP.I REALLY APPRECIATE IT.
a)i)Analyse the conversion process of pepsinogen to pepsin. (Smarks) li)lllustrate a labelled diagram of a motor neuron. (5marks) lī)Construct labelled diagrams of sacromes to show the relaxation and contraction of muscle. (5marks) Iv)Illustrate the cross-section of three (3) types of...
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6. (a) Show the arrangement of the groups on the a carbon of the naturally occurring amino acids (draw out the stereocentre). (b) What is the significance of chirality in the biological world? 7. (a) Sh (a) Show the repeating unit of the polypeptide chain in a protein and indicate the peptide bond. (b) What are the following structures of a protein (i) primary, (ii) secondary, (iii) tertiary and (iv) quaternary. 1. Polypeptides are the natural polymer of the naturally...
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