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Q4:
Why do we consider blood as a connective tissue?
Solution :
1. Theoretical Foundation: Defining Connective Tissue
In biological taxonomy, a tissue is classified as connective tissue if it meets three specific histological criteria:
- Matrix-Origin Relationship: The presence of a specialized extracellular matrix produced by the cells within the tissue [Per the Mesodermal Origin Principle].
- Structural Composition: It consists of specialized cells suspended in a non-living ground substance.
- Functional Integration: It functions to bind, support, protect, or transport substances between different body systems.
2. Comparative Analysis: Blood vs. General Connective Tissue
The following table illustrates the correspondence between the components of general connective tissue and the components of blood:
| Connective Tissue Component | Equivalent in Blood | Functional Description |
|---|---|---|
| Ground Substance (Matrix) | Plasma | The fluid medium composed of $90-92\%$ water, proteins, and electrolytes. |
| Specialized Cells | Formed Elements (RBCs, WBCs, Platelets) | Living cells suspended within the fluid matrix. |
| Fibers (Structural Support) | Fibrinogen (Soluble precursor) | Soluble protein fibers that polymerize into insoluble fibrin threads during coagulation. |
3. Morphological & Developmental Justification
Blood is classified as a fluid connective tissue based on the following developmental and structural evidence:
- Embryonic Origin: Like all connective tissues (bone, cartilage, adipose), blood originates from the mesoderm during embryonic development [Per the Germ Layer Theory].
- Matrix Characteristics: The plasma acts as the intercellular matrix, analogous to the collagenous matrix of bone or the chondroitin sulfate matrix of cartilage.
- Structural Connectivity: Blood connects various body systems by transporting nutrients, gases, hormones, and metabolic wastes, essentially acting as the "connective" link between cells and the external environment.
- Fiber Formation: Unlike other connective tissues where fibers are permanent, blood produces fibers (fibrin) only upon injury, which serves to bind the site of damage, fulfilling the "binding" function of connective tissue.
4. Visual Representation of Composition
Final Solution: Blood is classified as a connective tissue because it originates from the mesoderm, consists of specialized cells suspended in a non-living intercellular fluid matrix (plasma), and serves the fundamental connective function of linking various physiological systems through the transport of materials.
More Questions from Class 11 Biology Body Fluids and Circulation EXERCISES
- Q1: Name the components of the formed elements in the blood and mention one major function of each of them.
- Q2: What is the importance of plasma proteins?
- Q3: Match Column I with Column II : Column I Column II (a) Eosinophils (i) Coagulation (b) RBC (ii) Universal Recipient (c) AB Group (iii) Resist Infections (d) Platelets (iv) Contraction of Heart (e) Systole (v) Gas transport
- Q5: What is the difference between lymph and blood?
- Q6: What is meant by double circulation? What is its significance?
- Q7(a): Write the differences between : (a) Blood and Lymph
- Q7(b): Write the differences between : (b) Open and Closed system of circulation
- Q7(c): Write the differences between : (c) Systole and Diastole
- Q7(d): Write the differences between : (d) P-wave and T-wave
- Q8: Describe the evolutionary change in the pattern of heart among the vertebrates.
- Q9: Why do we call our heart myogenic?
- Q10: Sino-atrial node is called the pacemaker of our heart. Why?
- Q11: What is the significance of atrio-ventricular node and atrio-ventricular bundle in the functioning of heart?
- Q12: Define a cardiac cycle and the cardiac output.
- Q13: Explain heart sounds.
- Q14: Draw a standard ECG and explain the different segments in it.
CBSE Solutions for Class 11 Biology Body Fluids and Circulation
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
- Excretory Products and Elimination
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
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