Latest questions in this category.
The pericardium is a protective membrane filled with fluid that reduces friction during heartbeats.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood Groups - ABO Rh System and Coagulation
Fibrinogen is converted to fibrin during blood clotting, forming a mesh that helps stop bleeding.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood Groups - ABO Rh System and Coagulation
Platelets are cell fragments derived from megakaryocytes and are involved in blood clotting.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood Groups - ABO Rh System and Coagulation
Rh incompatibility between an Rh-negative mother and Rh-positive fetus can cause erythroblastosis fetalis.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood Groups - ABO Rh System and Coagulation
Blood group O has no A or B antigens, making it suitable for transfusion to any blood group.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood Groups - ABO Rh System and Coagulation
Platelets release clotting factors, initiating the coagulation cascade to form a clot.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood Groups - ABO Rh System and Coagulation
Veins carry blood under low pressure. Therefore, they possess valves that prevent the backflow of blood and ensure one-way movement towards the heart.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood Groups - ABO Rh System and Coagulation
The statement is incorrect because plasma is a viscous, straw-coloured fluid. Its viscosity is mainly due to dissolved plasma proteins such as albumin, globulins and fibrinogen. Plasma makes up about 55% of the total blood volume.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood Groups - ABO Rh System and Coagulation
Calcium ions (Ca²⁺) are essential for the blood clotting cascade, activating clotting factors.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood Groups - ABO Rh System and Coagulation
Veins carry blood under low pressure and have valves to prevent backflow.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood Groups - ABO Rh System and Coagulation
The pericardium is a double-layered membrane filled with pericardial fluid, which reduces friction during heartbeats.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood Groups - ABO Rh System and Coagulation
The human heart is myogenic, meaning it generates its own electrical impulses.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood Groups - ABO Rh System and Coagulation
