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Q. No.Cells of human body exhibit three main types of movements. Cytoskeleton elements called microfilaments play an important role in:
A. Amoeboid movements
B. Ciliary movements
C. Muscular movements
| 1. | Only A | 2. | Only A and B |
| 3. | Only A and C | 4. | A, B and C |
Subtopic: Introduction to Locomotion |
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The structure shown in the given diagram is a:
1. Muscle fibre
2. Myofibril
3. Myofilament
4. Myoblasts
Subtopic: Skeletal Muscle: Myofilaments |
51%
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A motor neuron along with the muscle fibers connected to it constitute:
1. a neuromuscular junction
2. a motor unit
3. a syncytium
4. a fascicle
1. a neuromuscular junction
2. a motor unit
3. a syncytium
4. a fascicle
Subtopic: Muscle Contraction: Other Considerations |
58%
From NCERT
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Bundles of skeletal muscle fibres called fascicles are enclosed by a connective tissue known as:
| 1. | Fascia | 2. | Perimysium |
| 3. | Endomysium | 4. | Epimysium |
Subtopic: Skeletal Muscle: Basic Anatomy |
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Sliding filament theory can be best explained as
| 1. | when myofilaments slide pass each other actin filaments shorten while myosin filament do not shorten |
| 2. | actin and myosin filaments shorten and slide pass each other |
| 3. | actin and myosin filaments do not shorten but rather slide pass each other |
| 4. | when myofilament slide pass each other myosin filament shorten while actin filaments do not shorten |
Subtopic: Sliding Filament Theory |
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NEET - 2015
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What are the sequential steps in the formation and breakage of a cross-bridge in muscle contraction?
| 1. | Myosin head hydrolyzes ATP, attaches to actin, performs a power stroke, and releases ADP. |
| 2. | Myosin head binds to ATP, detaches from actin, hydrolyzes ATP, and reattaches to actin. |
| 3. | Myosin head releases ADP, binds to ATP, detaches from actin, and hydrolyzes ATP. |
| 4. | Myosin head attaches to actin, performs a power stroke, binds ATP, and then detaches from actin. |
Subtopic: Sliding Filament Theory |
From NCERT
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Consider the given two statements:
| Assertion (A): | Red muscle fibers are adapted to generate quick, forceful contractions. |
| Reason (R): | Red muscle fibers have high glycolytic capacity. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Skeletal Muscle: Basic Anatomy |
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A motor unit is composed of:
| 1. | a motor neuron and all of the skeletal muscle fibers innervated by the neuron's axon terminals. |
| 2. | all motor neurons and all of the skeletal muscle fibers innervated by them in a muscle. |
| 3. | a motor neuron and one skeletal muscle fiber innervated by the neuron. |
| 4. | a motor neuron and a sensory neuron. |
Subtopic: Sliding Filament Theory | Muscle Contraction: Other Considerations |
56%
From NCERT
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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 ‘G’ [globular] actin is a polymer of monomeric ‘F’ actins. |
| Statement II: | The globular head is an active ATPase enzyme and has binding sites for ATP and active sites for actin. |
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
Subtopic: Skeletal Muscle: Myofilaments |
56%
From NCERT
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Consider the statements given below and choose the option that correctly states them as true(T) or false (F)
| (a) | Locomotion, changes of body postures and heat production are some of the functions of skeletal muscle tissue |
| (b) | Actin filaments are firmly attached to the Z-line |
| (c) | The portion of myofibril between non-consecutive 'Z' lines is called sacromere |
| (d) | Muscles constitute more than 50% of the body weight in an adult human |
| a | b | c | d | |
| 1. | T | T | T | T |
| 2. | T | F | F | T |
| 3. | T | T | F | F |
| 4. | F | T | T | T |
Subtopic: Introduction to Locomotion | Skeletal Muscle: Basic Anatomy | Skeletal Muscle: Sarcomere |
57%
From NCERT
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