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Lymph does not contain red blood cells; it carries white blood cells and helps in immune defense.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Common Diseases - Protozoan - Malaria Amoebiasis
The QRS complex represents ventricular depolarization, not atrial contraction.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
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