Sarcomere, actin filaments, myosin filla...

Sarcomere, actin filaments, myosin fillaments, sarcoplasmic reticulum.

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Sarcomere

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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.

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.

Sarcolemma, sarcoplasm and sarcoplasmic reticulum refer to particular type of cell in our body. Which is this cell and to what parts of that cell do these names refer to ?

Go through the following statements During muscle contraction, the width of A-band remains constant while I-band shortens. During muscle contraction, the Ca^(2+) released from the SR bind to the troponin component of thin filament The process of muscle contraction is faster in smooth muscle as they have a well developed sarcoplasmic reticulum. The red muscle fibres have abundant mitochondria, low glycogen and poorly formed sarcoplasmic reticulum.

ICSE-LOCOMOTIONA ND MOVEMENT -TEST YOUR PROGRESS ( VERY SHORT ANSWER TYPE QUESTIONS )

What happens to the l band and H zone during contraction? Do the lengt...
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Which muscle protein binds with calcium ions that are released from th...
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What would happen if ATP were suddenly not available after the sarcome...
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What kind of contraction occurs in your neck muscles while you are rea...
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Where is the belly of the muscle that extends the forearm located?
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What major muscle causes frowning, smiling, pouting, and squinting?
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Which muscles roll the eyeballs laterally?
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Which abdominal muscle aids in urination?
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Red muscle fibres can continue contracting for prolonged durations wit...
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Name the smallest bones in the body.
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Sarcomere, actin filaments, myosin fillaments, sarcoplasmic reticulum.
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Mark the wrong item in each of the following series : pronator, li...
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Hip joint, knee joint, ankle joint, elbow joint.
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Shoulder joint, toe joint, ankle joint, intervertebral joint.
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Name the cells/tissues in human body which : exhibit amoeboid movem...
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Name the cells/tissues in human body which : exhibit ciliary moveme...
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Which tissue is afflicted by Myasthenia gravis?
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The three tiny bones present in middle ear are called ear ossicles. Wr...
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