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Q2:
What is the importance of plasma proteins?
Solution :
1. Theoretical Foundation of Blood Plasma
Blood plasma constitutes approximately 55% of the total blood volume. It is a straw-colored, viscous fluid containing 90-92% water and 6-8% proteins. These proteins are synthesized primarily in the liver and are critical for maintaining homeostatic balance within the circulatory system.
2. Primary Categories and Physiological Functions
The major plasma proteins include Fibrinogens, Globulins, and Albumins. Each performs distinct biological roles as outlined below:
| Protein Type | Primary Function | Mechanism/Justification |
|---|---|---|
| Fibrinogens | Blood Coagulation | Converted into fibrin threads during injury to form a meshwork that traps formed elements [Cascade Theory of Blood Clotting]. |
| Globulins | Immune Defense | Primarily immunoglobulins (antibodies) produced by plasma cells; essential for neutralizing pathogens [Antigen-Antibody Interaction]. |
| Albumins | Osmotic Regulation | Maintains the Colloid Osmotic Pressure (Oncotic Pressure) of blood to prevent plasma leakage into interstitial spaces [Starling’s Law of Capillary Fluid Exchange]. |
3. Granular Analysis of Importance
A. Maintenance of Oncotic Pressure: Albumins are the most abundant plasma proteins. By remaining within the capillary lumen, they exert osmotic force that pulls water back into the circulatory system, counteracting hydrostatic pressure [Per the Principle of Osmosis].
B. Hemostasis: Fibrinogen is a soluble plasma glycoprotein. When a vascular injury occurs, thrombin cleaves fibrinogen into fibrin monomers, which polymerize to create a stable plug [By Enzymatic Cascade].
C. Humoral Immunity: Globulins are categorized into $\alpha$, $\beta$, and $\gamma$ globulins. The $\gamma$-globulins act as antibodies, which recognize and bind to foreign antigens, facilitating phagocytosis [Immune System Specificity].
D. Transport and Buffering: Plasma proteins act as carrier molecules for insoluble hormones, lipids, and vitamins. Furthermore, they function as weak acids/bases, providing a buffering capacity to maintain blood pH within the narrow range of $7.35$ to $7.45$ [Acid-Base Homeostasis Principle].
4. Visual Representation of Fluid Dynamics
Final Solution: Plasma proteins are vital because they maintain blood colloid osmotic pressure (Albumins), facilitate essential blood clotting mechanisms (Fibrinogens), provide immunological defense (Globulins), and assist in the transport of insoluble solutes and pH buffering within the circulatory system.
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.
- 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(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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