Question

Study the following statements regarding muscle and identify incorrect statements.
A) In mammals the sarcolemma penetrate between A and I bands to form T-tubule.
B) Tetanus is caused due to accumulation of uric acid crystals.
C) Troponin is distributed at regular intervals on tropomyosin.
D) White muscle fibres have more mitochondria and depends on anaerobiosis.

• A. A & C
• B. B & C
• C. B & D
• D. A & D

Hint:

Do not confuse physiological tetanus (sustained contraction) or the infection Tetanus with Gout (uric acid deposition).
Red fibers = high myoglobin, high mitochondria, aerobic.
White fibers = low myoglobin, low mitochondria, anaerobic.

Answer 1

The Correct Option is C

Step 1: Recall what each statement should say if true.
T-tubules are sarcolemma invaginations at the A-I band junction, tetanus is a bacterial toxin causing sustained muscle spasm, troponin sits at intervals along tropomyosin, and white fibres rely on anaerobic glycolysis with fewer mitochondria.
Step 2: Compare each statement against this baseline.
Statement A matches the known anatomy so it is correct. Statement C also matches, troponin really is spaced along the tropomyosin filament.
Step 3: Spot the mismatches.
Statement B is wrong because tetanus results from a bacterial neurotoxin blocking inhibitory signals, not from uric acid crystals building up, that description actually fits gout. Statement D is wrong because white fibres are built for quick anaerobic bursts and therefore have fewer mitochondria, not more.
Final answer: Option 3, statements B and D are incorrect.