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Q7(d):
Write the differences between : (d) P-wave and T-wave
Solution :
1. Conceptual Foundation of the Electrocardiogram (ECG)
The electrocardiogram (ECG) is a graphic representation of the electrical activity of the heart during a single cardiac cycle. The electrical impulses are generated by the sinoatrial (SA) node and transmitted through the cardiac conduction system, resulting in mechanical contraction (systole) and relaxation (diastole) [Per the Principle of Electrophysiology].
2. Comparative Analysis: P-Wave vs. T-Wave
| Feature | P-Wave | T-Wave |
|---|---|---|
| Definition | The initial small upward deflection in an ECG tracing. | The final small upward deflection following the QRS complex. |
| Physiological Event | Represents atrial depolarization [Initiated by the SA node]. | Represents ventricular repolarization [Return to the excited state]. |
| Functional Outcome | Triggers the contraction of both atria (Atrial Systole). | Marks the end of ventricular systole and the beginning of ventricular diastole. |
| Duration/Timing | Occurs at the start of the cardiac cycle. | Occurs at the end of the ventricular contraction phase. |
3. Visual Representation of ECG Waves
4. Summary of Physiological Significance
- P-Wave Significance: The depolarization signifies the excitation signal traveling from the SA node through the atrial musculature, resulting in atrial contraction which pumps blood into the ventricles [By the Law of Cardiac Conduction].
- T-Wave Significance: The repolarization signifies the ventricles returning to a polarized (resting) state. This is a critical recovery phase allowing the heart to prepare for the subsequent cardiac cycle [Per Homeostatic Recovery Mechanisms].
Final Solution: The P-wave represents atrial depolarization, initiating atrial contraction, while the T-wave represents ventricular repolarization, marking the end of ventricular systole and the return of ventricles to a resting state.
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(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
- 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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