Practice questions covering the structure of the human heart and the stages of the cardiac cycle. Ideal for students preparing for biology and medical exams.
The bicuspid valve is also called the mitral valve and is located between the left atrium and left ventricle.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
The bicuspid valve is also called the mitral valve and is located between the left atrium and left ventricle.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
The "Lub" sound occurs when the AV valves (tricuspid and bicuspid) close, while the "Dub" sound occurs when the semilunar valves close.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
The cardiac cycle consists of systole (contraction) and diastole (relaxation) of the heart chambers.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
Diastole is the relaxation phase of the heart, allowing blood to fill the chambers.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
Systole refers to the contraction phase of the heart, during which blood is pumped out.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
The right atrium receives deoxygenated blood from the body via the superior and inferior vena cava.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
The tricuspid valve lies between the right atrium and right ventricle. It prevents the backflow of blood into the right atrium during ventricular systole.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
Purkinje fibres rapidly conduct electrical impulses throughout the ventricular walls, producing a synchronized contraction of both ventricles for efficient pumping of blood.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
The SA node (sinoatrial node) acts as the pacemaker of the heart, initiating electrical impulses that regulate heartbeats.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
Pulmonary circulation carries oxygenated blood from the lungs to the left atrium of the heart.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
Pulmonary veins carry oxygenated blood from the lungs to the left atrium, not deoxygenated blood.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
