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Q7(a):
Write the differences between : (a) Blood and Lymph
Solution :
1. Conceptual Definitions
Blood is a specialized connective tissue consisting of a fluid matrix (plasma) and formed elements (RBCs, WBCs, and platelets) that circulates within a closed cardiovascular system. Lymph is a clear fluid that originates as interstitial fluid from blood plasma, flowing through an open-ended lymphatic system, acting as a middleman between blood and tissue cells [Per physiological fluid dynamics].
2. Comparative Tabulation of Biological Properties
| Property | Blood | Lymph |
|---|---|---|
| Color | Red due to hemoglobin. | Colorless or straw-colored. |
| Composition | RBCs, WBCs, Platelets, Plasma. | Only Lymphocytes and Plasma. |
| Protein Content | High (Albumins, Globulins, Fibrinogen). | Low (fewer proteins than blood). |
| Flow Mechanism | Pumped by the heart (High pressure). | Slow, unidirectional (Low pressure). |
| Function | Transport of gases, nutrients, and waste. | Immune defense and fat absorption. |
3. Physiological Mechanism & SVG Visualization
The transition from blood to lymph occurs at the capillary bed, where hydrostatic pressure forces plasma out of the blood vessels to form interstitial fluid, which then enters lymphatic capillaries [Per Starling's Law of Filtration].
4. Critical Biological Distinctions
- Oxygenation: Blood possesses $Hb$ (Hemoglobin) for $O_2$ transport, whereas lymph lacks $Hb$ and carries mainly waste products and lipids from the digestive tract [Per Respiratory Physiology].
- Clotting Ability: Blood clots rapidly due to high concentration of clotting factors (fibrinogen/platelets). Lymph clots very slowly due to significantly lower concentrations of clotting factors [Per Hematological homeostasis].
- Immune Role: Lymph acts as a reservoir for lymphocytes, playing a pivotal role in the lymphatic nodes for filtration of pathogens before the fluid is returned to the venous circulation via the thoracic duct [Per Immunology].
Final Solution: Blood is a red, high-pressure, oxygen-carrying fluid within a closed circuit, whereas Lymph is a colorless, low-pressure, immunological fluid that serves as a bridge for fluid homeostasis and lipid transport.
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
- Q4: Why do we consider blood as a connective tissue?
- Q5: What is the difference between lymph and blood?
- Q6: What is meant by double circulation? What is its significance?
- 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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