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Sarcomere

Fill in the b...

Question

Fill in the blanks.
$a .$ The light band contains actin and is called … $1$ … band.
$b$ .The thick filaments in the … $2$ … band are held together in the middle of this band by a thin fibrous membrane called … $3$ … line.
c.In the centre of each ‘I’ band is an elastic fibre called … $4$ … line which bisects it.
$d$ .The central portion of the thick filament which is not overlapped by thin filaments is called the …‘ $5$ ’...

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Solution

a. The light band contains actin and is called …’I’… band.

b.The thick filaments in the …’A’… band are held together in the middle of this band by a thin fibrous membrane called … ‘M’ … line.

c.In the centre of each ‘I’ band is an elastic fibre called … ‘Z’ … line which bisects it.

d.The central portion of the thick filament which is not overlapped by thin filaments is called the …‘H zone’...

Final answer
$(c)$ 1-‘I’, 2-‘A’, 3-‘M’, 4-‘Z’, 5-H zone

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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 following A to D statements and select the one option that contains both correct statements.

a. Z-line is present in the centre of the light band
b. Thin filaments are firmly attached to the M-line
c. The central part of thick filaments, not overlapped by thin filaments is called Z-band
d. Light band contains only thin filaments

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.

Q. Identify the correct statements.

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

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.

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Standard IX Biology

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