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Aslam o alikum I am Hassam ur Rahman and I am teaching Fsc biology since 2014 .I am always trying to improve myself and provide best lecture to students.i am taking content for the lecture from authentic and relevant sources but human errors are possible . you are requested to please highlight the mistakes.My lectures are equally reliable for Fsc and mdcat students #visiblescience #mdcatbiology #alevelbiology#Electrocardiogram #ECG #Class11Biology#federalboardbiology here are my personal channel, I am sure it will change your life and very beneficial for you / @hassamurrahman My Facebook page link https://www.facebook.com/hassamUrRahm... Description: In this comprehensive lecture, we explain the Electrocardiogram (ECG) in detail according to the Class 11 Biology syllabus. An electrocardiogram is a graphical recording of the electrical activity of the heart during one complete cardiac cycle. It helps in understanding how electrical impulses originate in the heart and spread through cardiac muscles to produce coordinated contractions. The lecture begins with the basic principle of ECG, explaining how electrodes placed on the body detect electrical changes generated by the heart. Each part of the ECG trace is discussed clearly, including the P wave, which represents atrial depolarization, the QRS complex, which shows ventricular depolarization, and the T wave, which indicates ventricular repolarization. The importance of the ST segment and PR interval is also explained for better conceptual understanding. Special focus is given to the relationship between the ECG and cardiac cycle, showing how electrical events control mechanical actions like systole and diastole. The role of the SA node, AV node, Bundle of His, and Purkinje fibers in generating and conducting electrical impulses is explained step by step. This lecture also highlights the clinical importance of ECG, including how abnormal ECG patterns help in diagnosing conditions such as arrhythmias, myocardial infarction, and conduction defects. The topic is explained in simple language, with an exam-focused approach, making it highly useful for FSC / Intermediate students, Punjab Board, and MDCAT preparation. This video strengthens understanding of heart physiology, electrical control of heartbeat, and diagnostic tools used in cardiology.