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Contraction

The contracti...

Question

The contractile unit of muscle is a part of myofibril between

A

Z line and Z line

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B

A band and I band

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C

Z line and A band

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D

Z line and I band

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Solution

The correct option is A
Z line and Z line

The region between two successive Z lines in a myofibril is a contractile unit called a sarcomere.

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Similar questions

Q. Assess the statements.
1. A-bands of the muscle is dark and contain myosin.
2. I-bands are the light bands and contain actin.
3. During muscle contraction the A-band contracts.
4. The part between the two Z-lines is called as sarcomere.
5. The central part of thick filament, not overlapped by thin filament, called H-zone.
Of the above statements.

Q. Read the statement regarding myofibril and choose the correct option:
1. Each myofibril has alternate dark and light bands.
2. In the center of each A band is an elastic fiber called Z-line.
3. A and I bands are arranged alternately throughout the length of myofibril.
4. The sarcomere is the functional unit of contraction.
5. The central part of thick filament not overlapped by a thin filament is the M line.

During muscle contraction, which of the following events occur?

(a) H-zone disappears
(b) A-band widens
(c) I-band reduces in width
(d) Width of A-band in unaffected
(e) M line and Z line come closer

Q. Pick out the number of correct statements regarding muscle contraction-
i) length of

a

band remains
ii) length of

i

band decreases
iii)

Z

line are pulled to centre
iv)

M

line are remaining same

Q. Identify the events occurring in muscular contraction;

(i) H-zone disappears

(ii) A band widens

(iii) I-band reduces in width

(iv) The width of A band is unaffected

(v) M-line and Z-line come closer

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