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Muscular Tissue

what is the d...

Question

what is the difference between troponin and tropomyosin?

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Solution

Troponin is a complex of three types of regulatory proteins that regulate the contraction of cardiac and skeletal muscles.
Tropomyosin is a double stranded coiled protein found in muscles. Troponin remains attached with tropomyosin inside the muscles.

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Q. Tropomyosin is found on myosin whereas, troponin is found on actin filament.

Actin binding sites are located on

(i) Myosin

(ii) Tropomyosin

(iii) Troponin

Q. Read the following statements:

(a) Each thin filament is made of two F-actins.

(b) Each G-actin is polymer of F-actins.

(c) Two filaments of tropomyosin run close to the F-actins throughout it's length.

(d) Troponin is distributed at irregular internals on the tropomyosin.

(e) During contracted state a subunit of troponin masks the actin binding sites for myosin on the actin filaments.

Choose the correct statement(s).

Q. Assertion: Calcium ions play a crucial role in muscle contraction.
Reason: Calcium ions bind troponin causing the displacement of tropomyosin, allowing the myosin head to bind actin.
Select the appropriate option:

Q. The further treatment of fibres with saturated salt solutions removes actin and its two associated proteins tropomyosin and troponin and also destroy the I-bands. This shows that the thin filaments are made up of................. proteins.

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