Proteins

The fibrous protein that is specifically present in muscles is myosin.

• Keratin: Found in hair, nails, and skin, not muscles.
• Albumin: A globular protein found in blood plasma.
• Insulin: A peptide hormone, not a fibrous protein.
• Myosin: A fibrous protein found in muscle tissue that plays a key role in muscle contraction.
• Histidine: An amino acid, not a protein.

Correct Answer: (D) Myosin