(B) voluntary, multinucleate, cylindrical

(C) involuntary, cylindrical, striated

(D) voluntary, spindle shaped, uninucleate

NEET · Biology · STD 11 - 7. Structural organisation in animal

Smooth muscles are

A involuntary, fusiform, non striated
B voluntary, multinucleate, cylindrical
C involuntary, cylindrical, striated
D voluntary, spindle shaped, uninucleate

Verified Solution

Answer & Solution

Correct Answer

(A) involuntary, fusiform, non striated

Step-by-step Solution

Detailed explanation

(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.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Explore more questions on app

From NEET

Explore more questions on app

Column\(-I\)	Column\(-II\)
\((a)\) Basal	\((i)\) Mustard
\((b)\) Axile	\((ii)\) China rose
\((c)\) Parietal	\((iii)\) Dianthus
\((d)\) Free central	\((iv)\) Sunflower