Home
Class 12
BIOLOGY
Assertion: on stimulation, a muscle cel...

Assertion: on stimulation, a muscle cell releases calcium ions `(Ca^(2+))` from sarcoplasmic reticulum.
Reason: By reacting with a protien complex, `Ca^(2+)` uncover active sites on the actin filaments.

A

Given below are assertion and reason. Point out if both are true with reason being correct explanation

B

both true but reason is not correct explanation

C

assertion true but reason is wrong

D

both are wrong

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • LOCOMOTION AND MOVEMENT

    DINESH PUBLICATION ENGLISH|Exercise CHECK YOUR GRASP|10 Videos
  • LOCOMOTION AND MOVEMENT

    DINESH PUBLICATION ENGLISH|Exercise CHECK YOUR GRASP|10 Videos
  • LEAF

    DINESH PUBLICATION ENGLISH|Exercise CYG|10 Videos
  • MAMMALIA [MAMMA - BREAST]

    DINESH PUBLICATION ENGLISH|Exercise Brain Teasers - I|100 Videos

Similar Questions

Explore conceptually related problems

[A] : Upon stimulation of a muscle cell, cal- cium ions (Ca^(++)) are released from the sar- coplasmic reticulum. [R]: In reacting with a protein complex, Ca^(++) unmasks myosin binding sites on the ac-tin filaments.

Which muscle protein binds with calcium ions that are released from the sarcoplasmic reticulum?

Assertion: Plants absorb calcium from soil in the form of calcium ions (Ca^(2+)) Reason: Calcium is required by meristematic and differentiating tissues.

During muscle contraction, what could be the correct sequence ? A. Release of calcium ions into the sarcoplasm. B. Release of Acetylcholine. C. Sliding of actin filaments over each other. D. Break down of ATP to form a cross bridge.

Assertion :- Prothrombinase enzymes converts prothrombin into active thrombin. Reason : Thromboplastin react with plasma protein in the presence of Ca^(+2) ions to form prothrombinase.

Assertion :- Skeletal muscle fibre is synctium as the sarcoplasm contains many nuclei. Reason :- The sarcoplasmic reticulum of the muscle fibre is the store house of calcium ions. (a) If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion . (b) If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion (c) If Assertion is True but the Reason is False. (d) If both Assertion & 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.

How many EDTA molecules are required to make an octahedral complex with a Ca^(2+) ion?

Assertion (A). In cardiac muscles , impulses are transmitted rapidly . Reason (R) . Gap junctions allow quick passage of ions from one cell to the other.

DINESH PUBLICATION ENGLISH-LOCOMOTION AND MOVEMENT-REVISION QUESTIONS FROM COMPETITIVE EXAMS.
  1. Sarcomere is the functional unit of contraction in a muscle fibre. Ind...

    Text Solution

    |

  2. Identify the pair having amphicoelous vertabrae

    Text Solution

    |

  3. Match the columns and find the correct option {:(,"I",,"II",),((a),"...

    Text Solution

    |

  4. Match the lists and find the correct option {:(,"I",,"II",),((a),"Mu...

    Text Solution

    |

  5. Choose two correctly paired sets (a) Sphenoid bone-Keystone-Cranium (...

    Text Solution

    |

  6. Find the correct match {:(,"I",,"II",),((a),"Pisiform bone",(i),"Rum...

    Text Solution

    |

  7. Study the following and identify the incorrect statements (i) Muscl...

    Text Solution

    |

  8. Anaerobic breakdown of glycogen due to repeated activation of muscles ...

    Text Solution

    |

  9. A collagenous connective tissue layer hold the muscle bundles ...

    Text Solution

    |

  10. How many facial bones are present in pairs

    Text Solution

    |

  11. Prolonged activation of striated muscle causes it to fatigue. What is ...

    Text Solution

    |

  12. Which part of ulna is called elbow?

    Text Solution

    |

  13. In anaerobic reaction of muscle, lactic acid is produced which causes ...

    Text Solution

    |

  14. Which one of the following is not related to bone disorder

    Text Solution

    |

  15. Lack of relaxation between successive stimuli in sustained muscle cont...

    Text Solution

    |

  16. Name the ion responsible for unmasking of active sites for myosin for ...

    Text Solution

    |

  17. The H-zone in the skeletal muscle fibre is due to

    Text Solution

    |

  18. Assertion: on stimulation, a muscle cell releases calcium ions (Ca^(2...

    Text Solution

    |

  19. Out of 'X' pairs of ribs in humans only 'Y' pairs are true ribs. Selec...

    Text Solution

    |

  20. The pivot joint between atlas and axis is a type of

    Text Solution

    |