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Q4(b):
Write true or false. If false change the statement so that it is true.
(b) H-zone of striated muscle fibre represents both thick and thin filaments.
Solution :
Step 1: Analyzing the Statement
The statement posits that the H-zone (Hensen’s zone) in a striated muscle fibre (sarcomere) is composed of both thick ($myosin$) and thin ($actin$) filaments. To evaluate the truth value of this assertion, we must refer to the Sliding Filament Theory and the ultrastructure of the sarcomere.
Step 2: Defining the H-zone Structure
In a relaxed sarcomere, the banding pattern is defined by the arrangement of myofilaments:
- A-band (Anisotropic band): Contains the entire length of the thick ($myosin$) filaments, with a region of overlap where thin ($actin$) filaments are also present.
- I-band (Isotropic band): Contains only thin ($actin$) filaments, bisected by the $Z$-line.
- H-zone: A specific central region within the A-band where the thick filaments are present, but the thin filaments do not extend into this space.
[Justification: Per the Sliding Filament Theory of muscle contraction, the H-zone represents the central portion of the A-band where actin filaments are absent.]
Step 3: Verification and Correction
Since the H-zone contains only thick ($myosin$) filaments and lacks thin ($actin$) filaments, the original statement is False.
Step 4: Precise Visual Representation of Sarcomere Organization
Step 5: Formulating the Corrected Statement
To render the statement true, we must clarify that the H-zone is exclusively composed of thick filaments. Alternatively, one could state that the A-band (not the H-zone) is the region that represents both filaments.
Final Solution: False. The H-zone of a striated muscle fibre contains only thick filaments (myosin) and lacks thin filaments (actin).
More Questions from Class 11 Biology Locomotion and Movement EXERCISES
- 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.
- Q4(a): Write true or false. If false change the statement so that it is true. (a) Actin is present in thin filament
- Q4(c): Write true or false. If false change the statement so that it is true. (c) Human skeleton has 206 bones.
- Q4(d): Write true or false. If false change the statement so that it is true. (d) There are 11 pairs of ribs in man.
- Q4(e): Write true or false. If false change the statement so that it is true. (e) Sternum is present on the ventral side of the body.
- Q5(a): Write the difference between : (a) Actin and Myosin
- Q5(b): Write the difference between : (b) Red and White muscles
- Q5(c): Write the difference between : (c) Pectoral and Pelvic girdle
- Q6: Match Column I with Column II : Column I Column II (a) Smooth muscle (i) Myoglobin (b) Tropomyosin (ii) Thin filament (c) Red muscle (iii) Sutures (d) Skull (iv) Involuntary
- Q7: What are the different types of movements exhibited by the cells of human body?
- Q8: How do you distinguish between a skeletal muscle and a cardiac muscle?
- Q9(a): Name the type of joint between the following:- (a) atlas/axis
- Q9(b): Name the type of joint between the following:- (b) carpal/metacarpal of thumb
- Q9(c): Name the type of joint between the following:- (c) between phalanges
- Q9(d): Name the type of joint between the following:- (d) femur/acetabulum
- Q9(e): Name the type of joint between the following:- (e) between cranial bones
- Q9(f): Name the type of joint between the following:- (f) between pubic bones in the pelvic girdle
- Q10(a): Fill in the blank spaces: (a) All mammals (except a few) have __________ cervical vertebra.
- Q10(b): Fill in the blank spaces: (b) The number of phalanges in each limb of human is __________
- Q10(c): Fill in the blank spaces: (c) Thin filament of myofibril contains 2 ‘F’ actins and two other proteins namely __________ and __________.
- Q10(d): Fill in the blank spaces: (d) In a muscle fibre $Ca^{++}$ is stored in __________
- Q10(e): Fill in the blank spaces: (e) __________ and __________ pairs of ribs are called floating ribs.
- Q10(f): Fill in the blank spaces: (f) The human cranium is made of __________ bones.
CBSE Solutions for Class 11 Biology Locomotion and Movement
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Animal Kingdom
- Morphology of Flowering Plants
- Anatomy of Flowering Plants
- Structural Organisation in Animals
- Cell – The Unit of Life
- Biomolecules
- Cell Cycle and Division
- Transport in Plants
- Mineral Nutrition
- Photosynthesis
- Respiration in Plants
- Plant Growth and Development
- Digestion and Absorption
- Breathing and Exchange of Gases
- Body Fluids and Circulation
- Excretory Products and Elimination
- Neural Control and Coordination
- Chemical Coordination and Integration
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