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Define sliding filament theory of muscle contraction.
Biology
Biology

Class 11

NCERT

Publisher:
NCERT
Subject:
Biology
1

Chapter 1: The Living World

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2

Chapter 2: Biological Classification

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3

Chapter 3: Plant Kingdom

12 questions

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4

Chapter 4: Animal Kingdom

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5

Chapter 5: Morphology of Flowering Plants

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6

Chapter 6: Anatomy of Flowering Plants

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7

Chapter 7: Structural Organization in Animals

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8

Chapter 8: Cell: The Unit of Life

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9

Chapter 9: Biomolecules

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10

Chapter 10: Cell Cycle and Cell Division

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11

Chapter 11: Transport in Plants

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12

Chapter 12: Mineral Nutrition

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13

Chapter 13: Photosysnthesis in Higher Plants

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14

Chapter 14: Respiration in Plants

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15

Chapter 15: Plant Growth and Development

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16

Chapter 16: Digestion and Absorption

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17

Chapter 17: Breathing and Exchange of Gases

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18

Chapter 18: Body Fluids and Circulation

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Chapter 19: Excretory Products and their Elimination

12 questions

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20

Chapter 20: Locomotion and Movement

10 questions

Q1
Draw the diagram of a sarcomere of skeletal muscle showing different regions.
Q2
Define sliding filament theory of muscle contraction.
Q3
Describe the important steps in muscle contraction.
View all question
21

Chapter 21: Neural Control and Coordination

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22

Chapter 22: Chemical Coordination and Integration

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Define sliding filament theory of muscle contraction.

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The sliding filament theory explains the process of muscle contraction during which the thin filaments slide over the thick filaments, which shortens the myofibril.
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Each muscle fibre has an alternate light and dark band, which contains a special contractile protein, called actin and myosin respectively. Actin is a thin contractile protein present in the light band and is known as the I-band, whereas myosin is a thick contractile protein present in the dark band and is known as the A-band. There is an elastic fibre called z line that bisects each I-band. The thin filament is firmly anchored to the z line. The central part of the thick filament that is not overlapped by the thin filament is known as the H-zone.
During muscle contraction, the myosin heads or cross bridges come in close contact with the thin filaments. As a result, the thin filaments are pulled towards the middle of the sarcomere. The Z line attached to the actin filaments is also pulled leading to the shortening of the sarcomere. Hence, the length of the band remains constant as its original length and the I-band shortens and the H-zone disappears.
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Question Text
Define sliding filament theory of muscle contraction.
TopicLocomotion and Movement
SubjectBiology
ClassClass 11
Answer TypeText solution:1
Upvotes61