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During muscular contraction, the myosin ...

During muscular contraction, the myosin head binds to the exposed active sites on actin to form a

A

Motor unit

B

Motor end plate

C

Cross bridge

D

Cross arm

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The correct Answer is:
C
During muscular contraction, the myosin head binds to the exposed active sites on actin to form a cross bridge.
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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.

During muscle contraction, actin and myosin ffrom

Active site of enzyme is formed by

During contraction of skeletal muscle Ca^(2+) bind to

Which of the following statements given below are true with reference to muscle contraction. I. Neurotransmitter acetycholine is released as nerve impulse reaches the end of axon and binds to receptor sites of motor end plate. II. Action potential passes from motor end plate over sarcoplasmic and then into the T-tubules and sarcoplasmic reticulum. III. Calcium ion are released into the sarcoplasm bind to troponin, causing a change in its shape and position. IV. Myosin cross bridges are able to bind to exposed active sites of actin. Choose the correct option.

Active site of an enzyme is formed of

Inhibitors that bind with enzyme at active site are -

Globular protein which masks active sites on F-actin is

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 .

A2Z-LOCOMOTION AND MOVEMENT-Section A: Topicwise Questions Topic 3 : Mechanism Of Muscle Contraction
  1. The junction between a motor neuron and the sarcolemma of the muscle f...

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  2. A neutral signal reaching the NM releases a neurotransmitter (acetylch...

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  3. During muscular contraction, the myosin head binds to the exposed acti...

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  4. In which of the following steps of muscle contraction energy is utilis...

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  5. In the given figure how many sarcomeres are seen?

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  6. Read the following statements and find out the incorrect statement.

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  7. Statements: 1. A bands are dark and contain myosin.  I-bands are ligh...

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  8. During contraction of muscles Ca^(2+) attaches to

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  9. Substance that accumulates in a fatigued muscle is

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  10. Muscle band that remains unchanged during contraction and relaxation o...

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  11. Match the following and mark the correct option {:("Column I", " ""C...

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  12. ATPase enzyme needed for muscle contraction is located in " ...

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  13. The functional unit of contractile system in a striated muscle is

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  14. Which one is a bone of forelimb?

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  15. Red muscles fibres are rich in

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  16. The reactions which change lactic acid into glycogen

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  17. Sliding filament theory of muscle contraction was given by

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  18. Which is true of muscle contraction?

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  19. During muscle contraction

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  20. Which of the following ions help in muscle contraction ?

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