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Cross bridges pull the actin chain as th...

Cross bridges pull the actin chain as the myosin heads return to their unenergized conformation.

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Myosin head separates from actin when :

Assertion : Ca^(2+) plays important role in the muscle contraction. Reason : Ca^(2+) Combines with troponin chain, displacing tropomyosin allowing the myosin head part to combine with actin to from actomyosin complex .

Assertion : Ca^(2+) plays important role in the musclc contraction. Reason : Ca^(2+) Combines with troponin chain, displacing tropomyosin allowing the myosin head part to combine with actin to from actomyosin complex . (a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion. (b (b) If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion. (c) If Assertion is true, but Reason is false . (d) If both Assertion and Reason are false.

The steps involved in the mechanism of muscle contraction are given below. Arrange the steps in proper sequential order and select the correct option. I. Release of calcium ions in the sarcoplasm. II. Signal sent by the CNS via a motor neuron. III. Binding of calcium with a subunit of troponin on actin filaments. IV. Generation of the action potential in the sarcolemma. V. Binding of myosin head to the exposed active sites on actin to form a cross-bridge. VI. Inward pulling of ‘Z’ line attached to actin causing shortening of the sarcomere. VII. Pulling of the attached actin filaments towards the centre of 'A' band. VIII. Release of neurotransmitter acetylcholine and generation of the action potential in the sarcolemma.

Which of the following statements about the molecular arrangement of actin and mysin In myofibre is/are incorrect ? (i) Each actin (thin filament) is made of 2F (filamentous) actins. (ii) F-actin is the polymer of G (globular) actin. (iii) 2F0actins are twisted into a helix. (iv) Two strands of tropomyosin (protein) lie in the grooves of F-actin. (v) Troponin molecules (complex proteins) are distributed at regular intervals on the tropomyosin. (vi) Troponin forms the head of the myosin molecule. (vii) The myosin is a polymerised protein.

Name the ion responsible for masking active sites for myosin for cross-bridge activity during muscle contraction

An aluminium wire of cross-sectional area (10^-6)m^2 is joined to a steel wire of the same cross-sectional area. This compound wire is stretched on a sonometer pulled by a weight of 10kg. The total length of the compound wire between the bridges is 1.5m of which the aluminium wire is 0.6 m and the rest is steel wire. Transverse vibrations are setup in the wire by using an external source of variable frequency. Find the lowest frequency of excitation for which the standing waves are formed such that the joint in the wire is a node. What is the total number of nodes at this frequency? The density of aluminium is 2.6 xx (10^3) kg//m^3 and that of steel is 1.04 xx 10^(4) kg//m^2 (g = 10m//s^2)

The myosin myofilament can be cleaved into a head and a tail piece. All of the following are accurate in describing the position of myosin in a sacromere except (i) A-band is the length of a myosin myoilaments (ii) A-band contains thin and thick myofilaments (iii) A-band does not include actin-binding sites

The correct sequence of events during relaxation of muscle is :- (i) Inactivation of the actin (ii) Ca^(++) returend to SR (iii) Cross bridges are boken

ICSE-LOCOMOTIONA ND MOVEMENT -TEST YOUR PROGRESS ( OBJECTIVE TYPE QUESTIONS ) (State whether the following statements are true or false .)
  1. ATP is involved in both sliding filament mechanism and in the maintena...

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  2. The strongest muscle in the body is present in the jaw.

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  3. A drop in the force of contraction after prolonged stimulation is know...

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  4. The only movable bone in the skull is the mandible that forms the lowe...

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  5. The functional unit of contractile system in the striped muscle is sar...

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  6. Involuntary muscles have no myosin or actin since they lack striations

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  7. Actin is actually a globular protein that assembles as a long beady st...

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  8. Intercalated discs make up striations in the skeletal muscle.

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  9. Cross bridges pull the actin chain as the myosin heads return to their...

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  10. In mammals, the cervical region of vertebral column always consists of...

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  11. Intervertbral disc is found in the vertebral column of

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  12. Knee joint and elbow joints are examples of ball and socket joint.

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  13. Macrophages and leucocytes exhibit

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  14. The muscles located in the inner walls of alimentary canal are striate...

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  15. Head of humerus bones articulates with glenoid cavity of pectoral gird...

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  16. Match the items of column 'A' with the alternatives given in column '...

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  17. Match the items of column 'A' with the alternatives given in column '...

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