Thick and thin filaments form the (i)____. The thick and thin filaments overlap and form a definite pattern that form repeating units called (ii).

(i) myofibrils (ii) sarcomere

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(i) sarcomere (ii) myofibrils

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(i) fascia (ii) fascicle

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(i) fascicle (ii) fascia

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Solution

The correct option is A
(i) myofibrils (ii) sarcomere

Thick and thin filaments are protein filaments which form cylindrical structures called myofibrils. Each myofibril is arranged in a pattern, which repeats itself throughout the length of the myofibril.This repeating pattern is called a sarcomere which is the basic contractile unit of a muscle fibre.

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Q. In the transverse section of myofibril, the region of A band where thick and thin filaments overlap, each actin filament is surrounded by __(A)__thick filaments and each myosin filament is surrounded by __(B)__ thin filaments.

Q. Match column I with column, option from. the codes given below:

Column I	Column II
A. Structural and functional -unit of a myofibril	(i) H-zone
B. Protein of thin filament	(ii) Myosin
C. Protein of thick filament	(iii) Sarcomere
D. The central part of thick filament not overlapped by thin filament	(iv) Actin

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