Smooth muscles are:
Correct answer: A. Involuntary, fusiform and nonstriated
- A. Involuntary, fusiform and nonstriated
- B. Voluntary, multinucleate and cylindrical
- C. Involuntary, cylindrical and striated
- D. Voluntary, spindle-shaped and uninucleate
Explanation
Smooth muscle fibres are elongated and spindle shaped (fusiform). Each fibre contains a single oval nucleus surrounded by cytoplasm (sarcoplasm). In the cytoplasm, myofibrils are arranged longitudinally. These fibres lack striations and sarcolemma, however they are enclosed by a plasma membrane.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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