IB SEHS Topic 2.2

What are red blood cells also known as?

• leucocytes

• thrombocytes

• erythrocytes

What is the role of platelets?

• Blod clotting

• Producing antibodies

• Engulfing pathogens

Which valve is located between the right atrium and right ventricle?

• aortic semilunar

• bicuspid

• tricuspid

• mitral

Which blood vessel takes deoxygenated blood from the heart to the lungs?

• pulmonary vein

• pulmonary artery

• aorta

• vena cava

Where is the electrical impulse for heart contraction generated?

• AV node

• Purkinje fibres

• Bundle of His

• SA node

Which structure carries the impulse down the septum of the heart?

• AV node

• Purkinje fibres

• Bundle of His

• SA node

Which structure carries the impulse through the ventricle walls to cause ventricular contraction?

• AV node

• Purkinje fibres

• Bundle of His

• SA node

What is the effect of the sympathetic nervous system?

• speeds up heart rate

• slows down heart rate

What is true of pulmonary circulation?

• carries deoxygenated blood to lungs to be oxygenated and oxygenated blood to the heart

• carries oxygenated blood to the lungs and deoxygenated blood to the heart

• returns deoxygenated blood from the body to the heart and oxygenated blood to the rest of the body

What is the equation that links heart rate, cardiac output and stroke volume?

• Q = SV x HR

• Q = SV - HR

• Q = SV + HR

• Q = SV / HR