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STD 11 - 7. Structural organisation in animal — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 7. Structural organisation in animal1 Mark
MCQ
Smooth muscles are
  • ✓
    involuntary, fusiform, non­striated
  • B
    voluntary, multinucleate, cylindrical
  • C
    involuntary, cylindrical, striated
  • D
    voluntary, spindle­shaped, uninucleate.
✓

Answer

Correct option: A.
involuntary, fusiform, non­striated
a
(a) : Smooth muscle fibres are elongated and spindle shaped (fusiform). Each fibre contains a single oval nucleus surrounded by cytoplasm (sarcoplasm). In cytoplasm myofibrils are arranged longitudinally. These fibres lack striations and sarcolemma, however are enclosed by plasma membrane.

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