Sarcomere

Q. What is sarcomere?

1. Part between two A- lines
2. Part between two H-lines
3. Part between two I - bands
4. Part between two z - lines

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.

During muscle contraction

1. the A band remains the same and the I band narrows.

2. the I band remains the same and the A band narrows.

3. both the A band and I band remain the same.

4. both the A band and I band narrow.

Q.

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

1. 2 Z bands

2. 2 A bands

3. A, H, and I bands

4. Actin filaments and myosin filaments

Q. Which of the following pairs of chemical substances, is correct categorization

1. Calcitonin and thymosin - thyroid hormones
2. Pepsin and prolactin - two digestive enzymes secreted in stomach
3. Troponin and myosin - complex proteins in striated muscles
4. Secretin and rhodopsin - Polypeptide hormones

Q. What type of tissue bring about movement in man

Q. Krause’s membrane is

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

Q. The part of skull that includes the cranium, the olfactory capsules and the optic capsules is known as?

1. Splanchnocranium
2. Dermatocranium
3. Neurocranium
4. Cranium

Q. Assertion :Smooth muscle fibres do not appear to be striated. Reason: This is due to regular alternate arrangement of thick and thin filaments is smooth muscle fibre.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Assertion is incorrect but Reason is correct.

Q. The globular protein molecule, which masks the active sites on the F-actin is

1. Tropomyosin
2. Myosin
3. Troponin
4. Light meromyosin
5. Heavy meromyosin

Q. Which statement is correct for muscle contraction?

1. Length of H-zone is increased
2. Length of A-band remains constant
3. Length of I-band gets increased
4. Length between two Z-lines gets increased

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

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

Q. Maam what is the function of meridonial muscle of ciliary muscle? Kindly tell.thank u

Q. In skeletal muscle myofibril is parallel, and both in smooth and cardiac they run longitudinaam I ri8 maam?l?

Q. What are Myoblasts?

Q. A sarcomere consists of

1. One A-band and one I-band
2. Half A-band and two half I-band
3. Half A-band and one I-band
4. One A-band and two half I-band

Q. The H-Zone in the skeletal muscle fiber is due to

1. The central gap between the actin filaments extending through myosin filaments in the A- band
2. the absence of myofibrils in the central portion of A- band
3. the central gap between the myosin filaments in the A-band
4. Extension of myosin filaments in the central portion of the A- band

Q. Protein molecules contributing to the appearance of anisotropic bands in sarcomere is

1. Actin
2. Troponin
3. Myosin
4. Both a & c