Mechanism of muscle contraction:
Sliding-filament hypothesis:
Hanson and Huxley stated this theory in 1955. According to this theory, the contractile unit of muscle is made up of two kinds of filaments that are, myosin and actin. Such filaments during contraction slide over one other. It has been noted that both at the time of contraction and stretching, the length of the ‘A band’ remains steady. The length of the ‘I band’, on the other hand, changes in accord with the length of the muscle.
Figure: Mechanism of muscle contractionDue to this, the Z discs are pulled altogether. Therefore successive sarcomeres are pulled. This leads to the contraction of muscle.ATP as the source of Energy for contraction:
For muscle in action, energy is needed. This energy is discharged by cleaving ATP molecules to ADP+ Pi. Greater quantity of work is performed by the muscle, with bigger amount of ATP which is cleaved. This energy binds with active site of the actin filament to contract.
Neuro muscular Transmission:
The muscles are innervated by myelinated nerve fibres which originate from the spinal cord. The nerve ending makes a junction, termed as neuromuscular junction. The nerve is associated at the midpoint of muscle fiber and hence action potential in the fiber travels in both directions. Whenever a nerve impulse reaches the neuro-muscular junction, a substance known as acetylcholine is discharged. The acetylcholine persuades muscle fiber for contraction.
Initiation of muscle contraction:
Initiation of the contraction of skeletal muscle starts with action potentials in the muscle fibres. Such elicit electrical currents which spread to the interior of the fiber, where Ca ions are discharged from sarcoplasmic reticulum. The Ca ions in turn start the chemical events of the contractile process. This overall procedure of controlling muscle contraction is termed as excitation.
Maximum strength of contraction:
The highest strength of contraction of a muscle operating at a usual muscle length is around 3.5 Kg/Sq.cm. of muscle.Changes in muscle strength:
Whenever a muscle starts to contract after a long period of rest, its primary strength of contraction might be as little as one half of its maximum strength. It gains strength after 30-50 muscle twitches. The weight lifters apply this to attain maximum capacity.
Latest technology based Biology Online Tutoring Assistance
Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Mechanism of muscle contraction homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Mechanism of muscle contraction, project ideas and tutorials. We provide email based Mechanism of muscle contraction homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Mechanism of muscle contraction. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Biology homework help and assignment help services. They use their experience, as they have solved thousands of the Biology assignments, which may help you to solve your complex issues of Mechanism of muscle contraction. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.
tutorsglobe.com properties of copper sulphate assignment help-homework help by online copper sulphate tutors
tutorsglobe.com cerebral cortex assignment help-homework help by online the brain tutors
www.tutorsglobe.com offers concurrent development model homework help, assignment help, case study, writing homework help, online tutoring assistance by computer science tutors.
www.tutorsglobe.com offers Logic Programming Languages homework help, assignment help, case study, writing homework help, online tutoring assistance by computer science tutors.
tutorsglobe.com working of centrifugal pump assignment help-homework help by online centrifugal pump tutors
tutorsglobe.com absorption of fats assignment help-homework help by online digestion of lipids tutors
Free IELTS Study Guide, IELTS Test Papers, IELTS Practice papers, IELTS Test pattern and general information, Find IELTS exam information and resource, material free at Tutorsglobe.com
www.tutorsglobe.com offers free tutorials and concepts of games with mixed strategies, analytical method, graphical method, simplex method, get solved your problems by live tutors.
Cell and its constituent organelles tutorial all along with the key concepts of cytoplasm, Nucleus, Chromatin, Nuclear Pore Complexes, Import into the nucleus, Export from the nucleus, Mitochondria and Chloroplasts, Golgi apparatus, Endoplasmic reticulum, Protoplasm, Cytoplasm
The objective of Activity Based Costing - To eliminate the distortions in computation of total costs as seen in the conventional costing system and bring more correctness in the computation of costs of products and services.
tutorsglobe.com physical and chemical basis of heredity assignment help-homework help by online chromosomal basis of inheritance tutors
www.tutorsglobe.com offers Data Warehouse homework help, assignment help, case study, writing homework help, online tutoring assistance by computer science tutors.
tutorsglobe.com regulation by respiratory mechanism assignment help-homework help by online buffers tutors
tutorsglobe.com method of computing cost of capital assignment help-homework help by online cost of capital tutors
polyurethane tutorial all along with the key concepts of properties of polyurethane, advantages of polyurethane, applications of polymers, usage per application of polymer
1954571
Questions Asked
3689
Tutors
1485099
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!