Biology · Class 11 · Chapter 15
Body Fluids and Circulation
12 lessons 90 min 2 simulations
This chapter follows the fluids that carry supplies to every cell and wastes away from them. It covers blood (plasma, formed elements, blood groups and clotting), lymph, the patterns of circulation across animals, the structure and rhythm of the human heart, the cardiac cycle and ECG, double circulation, how the heart is regulated, and common circulatory disorders.
What the exam asks
NEET draws heavily on the numbers here (percentages of WBC types, RBC and platelet counts, 72 beats per minute, 0.8 s, 70 mL stroke volume, 5 litres cardiac output, 120/80), on the ABO donor table, on the order of events in the cardiac cycle and the causes of lub and dub, and on what each ECG wave stands for. Marks are lost by swapping the causes of the two heart sounds, by misreading which blood groups can donate to which, and by confusing heart failure with cardiac arrest or a heart attack.
Lessons
12 lessons · 90 min
1Blood and plasmaNCERT §15 (opening text) and §15.1–§15.1.16 min2Formed elements: RBCs, WBCs and plateletsNCERT §15.1.26 min3Blood groupsNCERT §15.1.310 min 1 sim4Coagulation of bloodNCERT §15.1.46 min5Lymph (tissue fluid)NCERT §15.26 min6Circulatory pathways in animalsNCERT §15.36 min7The human heartNCERT §15.3.17 min8The cardiac cycleNCERT §15.3.211 min 1 sim9Electrocardiogram (ECG)NCERT §15.3.36 min10Double circulationNCERT §15.47 min11Regulation of cardiac activity and disordersNCERT §15.5–§15.67 min12Chapter reviewMust-know facts, traps and formulas12 min