Sarcomere

Q.

Choose the correct option to label the following parts

1. 1.Thin filament 2.Thick filament 3.Sarcomere

2. 1.Thick filament 2.Thin filament 3.Sarcomere

3. 1.Sarcomere 2.Thick filament 3.Thin filament

4. 1.Sarcomere 2.Thin filament 3.Thick filament

Q.

The H-Zone in the skeletal muscle fibre is due to ________

1. Extension of myofibrils in the central portion of A-band.

2. The absence of myofibrils in the central portion of A-band.

3. The central gap between myosin filaments in the A-band.

4. Central gap between actin filaments extending through myosin filaments in the A-band.

Q.

The region made of thin filaments is _______ .

1. A band

2. Z line

3. I band

4. H band

5. M Line

Q.

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

1. Sarcomere and Myofibrils

2. Myofibrils and sarcomere

3. Fascia and fascicle

4. Fascicle and Fascia

Q.

Identify different regions in the structure of myofibril

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1. 1.Z disc 2.H Zone 3.M Line 4.I band 5.A band

2. 1.Z disc 2.A Band 3.M line 4.H zone 5.I band

3. 1.Z disc 2.H Zone 3.M Line 4.A band 5.I Band

4. 1.Z disc 2. M line 3. H zone 4.A band 5.I band

Q.

Sarcomere is the smallest contractile unit in a muscle fibre which is limited by the area between

1. A, H, and I bands

2. 2 A bands

3. Actin filaments and myosin filaments

4. 2 Z bands

Q. Which of the following segments of a sarcomere do not decrease in length during muscular contraction

1. I – band
2. A – band
3. Z – line
4. H – zone

Q. A few molecules /parts are grouped into categories. Identify the incorrect grouping

1. Ilium, ischium, pubis $\to$ bones of pectoral girdle
2. Malleus, incus, cochlea $\to$ ear ossicles
3. Actin, myosin, rhodopsin $\to$ sarcomere
4. Cytosine, thymine, uracil $\to$ pyramidines

Q. Krause’s membrane is

1. Z – disc
2. Sarcolemma
3. T – system
4. Neuromuscular junction

Q. The smallest functional unit of striated muscle is

1. I band
2. Z band
3. Myofibril
4. Sarcomere