Contraction
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The H-Zone in the skeletal muscle fibre is due to ________
Extension of myofibrils in the central portion of A-band.
Central gap between actin filaments extending through myosin filaments in the A-band.
The central gap between myosin filaments in the A-band.
The absence of myofibrils in the central portion of A-band.
The ability of a muscle to be stimulated is called
contractility
excitability
elasticity
extensibility
Why muscle fibre is a syncitium?
What is a dark band?
Region where actin is present
Region where myosin is present
Region where both actin and myosin are present
Region where both actin and myosin are absent
Which of the following element helps in muscle contraction?
Calcium
Magnesium
Carbon
Nitrogen
Choose the correct statement about muscles.
There are 2 types of filaments- thin myosin and thick actin.
The region where both actin and myosin are present is seen as dark band.
Myosin filament forms the light band.
Actin filament forms the dark band.
The contraction of the ___ pulls the bones during movement.
muscles
joints
cartilages
ligaments
Flexor and extensor muscles are ___.
antagonistic muscles
complementary muscles
involuntary muscles
voluntary muscles
Which of the following statement is not true about muscle contraction?
Calcium ion helps in the binding of myofilaments
The impulse of contraction reaches the muscle through nerves
Energy is released as ATP at the actin head
Contraction of sarcomere results in contraction of muscles
Name the ion responsible for binding actin and myosin filaments.
Sodium
Potassium
Calcium
Magnesium
- Actin
- Myosin
- ATP
- Actomyosin
_____ are the chemical substances that increase energy production in muscles.
Fat
Proteins
Carbohydrates
Steroids
- Biceps
- Triceps
- Cardiac Muscle
- Thigh Muscle
Contraction of _____ pull the bones during movement.
- Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- Assertion is correct but Reason is incorrect
- Assertion is incorrect but Reason is correct
Reason: Muscle fibres are lacking in Hydra.
- Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- Assertion is correct but Reason is incorrect
- Both Assertion and Reason are incorrect
- Humulin and casein
- Albumin and calcium
- Actin and myosin
- Insulin and albumin
Just like a locomotive engine, muscles can only _____.
pull
push
relax
flex
- Calves
- Triceps
- Marrow
- Deltoids
- Abductors
- Complementary muscles
- Antagonistic muscles
- Adductors
A : During muscle contraction, the head of thick filament binds to the exposed active sites on thin filament to form a cross bridge.
R : Increase in Ca++ level leads to the binding of calcium with a subunit of tropomyosin on thin filaments and thereby remove the masking of active sites for thick filament.
इस खण्ड में एक कथन-कारण प्रकार का प्रश्न है, जिसमें 4 विकल्प (A), (B), (C) तथा (D) दिये गये हैं, जिनमें से केवल एक सही है।
A: पेशी संकुचन के दौरान, मोटे तंतु का शीर्ष एक क्रॉस सेतू बनाने के लिए पतले तंतु पर खुले सक्रिय स्थलों से बँध जाता है।
R: Ca++ स्तर में वृद्धि से पतले तंतुओं पर ट्रोपोमायोसिन की उपइकाई से कैल्शियम बँध जाता है और इस तरह मोटे तंतु के लिए ढ़के हुए सक्रिय स्थलों को खोल देता है।
- Both (A) and (R) are true but (R) is not the correct explanation of (A)
(A) तथा (R) दोनों सही हैं लेकिन (R), (A) का सही स्पष्टीकरण नहीं है - (A) is true but (R) is false
(A) सही है लेकिन (R) गलत है - Both (A) and (R) are true and (R) is the correct explanation of (A)
(A) तथा (R) दोनों सही हैं तथा (R), (A) का सही स्पष्टीकरण है - (A) is false but (R) is true
(A) गलत है लेकिन (R) सही है
- Sartorius
- Masseter
- Deltoideus
- Gluteus maximus