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Q6:
What is meant by double circulation? What is its significance?
Solution :
1. Definition of Double Circulation
Double circulation is a highly efficient circulatory mechanism observed in mammals, birds, and crocodiles, wherein the blood passes through the heart twice during each complete cycle of the body. The process is bifurcated into two distinct, sequential circuits:
- Pulmonary Circulation: The deoxygenated blood is pumped from the right ventricle into the lungs via the pulmonary artery for oxygenation. The oxygenated blood then returns to the left atrium via the pulmonary veins [Per anatomical flow in systemic vertebrates].
- Systemic Circulation: The oxygenated blood is pumped from the left ventricle into the aorta, distributing oxygen and nutrients to all systemic tissues. The deoxygenated blood is subsequently collected by the vena cava and returned to the right atrium.
2. Visual Representation of Double Circulation
3. Comparative Analysis of Circulatory Efficiency
| Feature | Systemic Circulation | Pulmonary Circulation |
|---|---|---|
| Vessel Pathway | Left Ventricle → Aorta → Tissues | Right Ventricle → Lungs → Left Atrium |
| Blood Status | Oxygenated (mostly) | Deoxygenated (mostly) |
4. Significance of Double Circulation
The evolutionary significance of double circulation is rooted in physiological optimization:
- Prevention of Mixing: By maintaining a strict separation between oxygenated and deoxygenated blood within the four-chambered heart, the tissues receive blood with the highest possible oxygen concentration [Based on the Efficiency of Gas Exchange Principle].
- Maintenance of High Metabolic Rates: This system supports the high energy demands of endothermic organisms (mammals and birds) by ensuring a constant and rapid supply of oxygenated blood.
- Differential Pressure Regulation: Double circulation allows for the blood to be pumped at different pressures. Systemic circulation operates at higher pressure to reach distant body parts, while pulmonary circulation operates at lower pressure to prevent damage to delicate alveolar capillaries in the lungs [By physiological hemodynamics].
Final Solution: Double circulation is the process where blood travels through the heart twice—once for pulmonary oxygenation and once for systemic distribution. Its primary significance lies in the total separation of oxygenated and deoxygenated blood, which maximizes metabolic efficiency and supports the high-energy requirements of complex endothermic organisms.
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?
- 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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