Notes

Class 11 CBSE Biology - Body Fluids and Circulation | Complete Notes PDF

"Comprehensive Class 11 CBSE Biology notes on Body Fluids & Circulation. Covers blood & lymph, blood groups, heart structure, double circulation, cardiac cycle, ECG, and disorders. Perfect for exam preparation & quick revision."

Description

Body fluids (blood & lymph) transport nutrients, O₂, hormones & wastes. Blood consists of plasma (55%, proteins, water) and formed elements: RBCs (O₂ transport), WBCs (immunity), platelets (clotting). ABO & Rh blood groups prevent incompatibility. Lymph drains tissue fluid & aids immunity.

Human heart (4-chambered) pumps blood via double circulation: pulmonary (to lungs) & systemic (to body). Cardiac cycle involves systole-diastole; regulated by SA node. ECG records electrical activity (P, QRS, T waves). Disorders include hypertension & heart attack. Key for efficient closed circulatory system in vertebrates.

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