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Q. No.Which statement accurately describes the types of muscle tissue and their differentiating features?
| 1. | Skeletal muscle is involuntary and striated, cardiac muscle is voluntary and striated, and smooth muscle is involuntary and non-striated. |
| 2. | Skeletal muscle is voluntary and striated, cardiac muscle is involuntary and striated, and smooth muscle is involuntary and non-striated. |
| 3. | All muscle types are involuntary, but only skeletal and cardiac muscles are striated. |
| 4. | All muscle types are striated, but only skeletal and smooth muscles are voluntary. |
Subtopic: Introduction to Locomotion |
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The H Zone in a sarcomere is:
| 1. | a band where only actin molecules are found |
| 2. | a band where only myosin molecules are found |
| 3. | an attachment point for actin molecules |
| 4. | an attachment point for myosin molecules |
Subtopic: Skeletal Muscle: Sarcomere |
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What happens during the contraction of a skeletal muscle fiber?
| 1. | The myosin filaments stay the same size but the actin filaments shorten |
| 2. | The sarcomeres shorten |
| 3. | The actin filaments stay the same size but the myosin filaments shorten |
| 4. | Both actin and myosin filaments shorten |
Subtopic: Excitation Contraction Coupling I |
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Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | Each actin (thin) filament is made of two ‘F’ (filamentous) actins helically wound to each other. |
| Statement II: | Each ‘F’ actin is a polymer of monomeric ‘G’ (Globular) actins. |
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Skeletal Muscle: Basic Anatomy | Skeletal Muscle: Myofilaments | Skeletal Muscle: Sarcomere |
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Consider the given two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | The unit in a myofibril from Z line to Z line is a sarcomere. |
| II: | A muscle motor unit includes one motor nerve fiber and all the muscle fibers innervated by it. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Skeletal Muscle: Basic Anatomy | Skeletal Muscle: Myofilaments | Skeletal Muscle: Sarcomere |
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Match the terms related to muscle contraction in Column A with their descriptions or associated terms in Column B:
Codes:
| Column A | Column B | ||
| A | Myosin | P | Blocks the active sites on actin filaments in a relaxed muscle |
| B | Actin | Q | Binds to troponin, causing the troponin to change shape and move tropomyosin away from the active sites |
| C | Tropomyosin | R | Thin filaments that slide past myosin during muscle contraction |
| D | Calcium Ions | S | Thick filaments that pull on actin filaments to shorten the muscle |
Codes:
| A | B | C | D | |
| 1. | S | R | P | Q |
| 2. | S | R | Q | P |
| 3. | P | Q | R | S |
| 4. | P | Q | S | R |
Subtopic: Skeletal Muscle: Basic Anatomy | Skeletal Muscle: Myofilaments |
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The structure of myosin and actin in muscle contraction involves:
1. A and B are correct
2. B and C are correct
3. A and C are correct
4. A, B and C are correct
| A: | Myosin having cross-bridges that attach to actin filaments. |
| B: | Actin filaments sliding over myosin to shorten the muscle. |
| C: | Myosin acting as a thin filament and actin as a thick filament. |
1. A and B are correct
2. B and C are correct
3. A and C are correct
4. A, B and C are correct
Subtopic: Sliding Filament Theory |
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What is the role of calcium ions in muscle contraction?
| 1. | They bind to troponin, changing its shape and removing the inhibition of actin by tropomyosin. |
| 2. | They directly bind to myosin, enabling it to bind to actin. |
| 3. | They increase the ATPase activity of myosin. |
| 4. | They form cross-bridges between actin and myosin filaments. |
Subtopic: Sliding Filament Theory |
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Skeletal muscles appear striated due to presence of two characteristic proteins in alternating dark and light bands. Which of the following is a correct match of the protein with its light refractive property and colour?
| Protein | Colour | Property | |
| 1. | Myosin | Light | Anisotropic |
| 2. | Actin | Dark | Anisotropic |
| 3. | Myosin | Dark | Isotropic |
| 4. | Actin | Light | Isotropic |
Subtopic: Skeletal Muscle: Myofilaments |
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During muscular contraction, which of the following events occur?
(a) 'H' zone disappears
(b) 'A' band widens
(c) 'I' band reduces in width
(d) Myosin hydrolyzes ATP, releasing the ADP and Pi
(e) Z-lines attached to actins are pulled inwards
Choose the correct answer from the options given below.
1. (b), (c), (d), (e) only
2. (b), (d), (e), (a) only
3. (a), (c), (d), (e) only
4. (a), (b), (c), (d) only
Subtopic: Skeletal Muscle: Myofilaments | Sliding Filament Theory |
90%
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