PrepBharat

1. The light bands (I-bands) of a skeletal muscles are known as
a) Isotropic bands
b) Anisotropic bands
c) Intercalated disc
d) Cross bridges

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2. Ciliary muscles are found in
a) Diaphragm of a mammal
b) Eyes of vertebrates
c) Heart of vertebrates
d) Stomach of frog

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3. Intercostal muscles are found in
a) Fingers
b) Thoracic ribs
c) Femur
d) Radius-ulna

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4. The special contractile protein actin is found in
a) Thick filaments of A-bands
b) Thin filaments of I-bands
c) Both thick and thin bands
d) Whole of myofibril

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5. Striped muscles have
a) One nucleus
b) Many nuclei
c) Two nuclei
d) No nuclei

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6. Contractile fibrils of muscles are called
a) Neurofibrils
b) Collagen fibres
c) Myofibrils
d) Elastin

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7.Myofibrils show alternate dark and light bands in
a) Cardiac muscles
b) Smooth muscles
c) Skeletal muscles
d) Both (a) and (c)

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8. Select the correct statement:
a) A-band is made up of thick myosin filament.
b) H-zone is present in the middle of A-band.
c) Actin and myosin are polymerized protein with contractility.
d) All the above

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9. Match the columns:

a) A–1, B–2, C–3, D–4
b) A–1, B–3, C–2, D–4
c) A–4, B–1, C–2, D–3
d) A–4, B–2, C–3, D–1

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10. Which of the following statements about the striated muscles is false?
1. Thick filaments in the ‘A’ band are also held together in the middle of this band by a thin fibrous membrane called ‘M’ line.
2. In the centre of each ‘I’ band is an elastic fibre called ‘Z’ line which bisects it.
3. The thin filaments are firmly attached to the ‘Z’ line.
4. This central part of thick filament, not overlapped by thin filaments is called the ‘H’ zone.
a) All of these
b) only 2
c) 1 and 4 only
d) none of these

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