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Mechanical Waves

Value based q...

Question

Value based questions.
Explain how any change in the A, H and I band lengths are brought about in terms of what happens to the actin and myosin filaments.

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Solution

The myosin filaments (constituting the A band) remain the same length whilst actin filaments slide over them towards each other. This effectively shortens the H and I bands.

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Similar questions

Q. Choose the option having all the correct statements:
I. Thin and thick filaments consist of myosin and actin, respectively.
II. The H-zone and I-band consists of only myosin and actin, respectively.
III. A-band contains both actin and myosin.
IV. M-line and Z-line are in the middle of thin and thick filaments, respectively.

Q. What happens to the I band and H zone during contraction? Do the lengths of the thick and thin filaments change?

Q. Describe the structure of actin and myosin filaments.

(The Length Sarcomere is

2.5 μ m (

= 1 μ m,)

= 1.5 μ m

1

Myosin filament &

1

Actin filament is surrounded by

3

Myosin filament.)

Q. Write briefly about the biological importance of Actin and myosin filaments.

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.

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