BIOLOGY

Which of the chambers has the highest pressure?

• Right verticle

• Left atrium

• Left verticle

Which blood vessel carries the deoxygenated blood to the right atrium?

• Vena cava

• Pulmonary vein

• Pulmonary artery

• All of them

Which blood vessels carries oxygenated blood from the heart to the whole body?

• Vena cava

• Aorta

• Pulmonary vein

What happen when the ventricles of the heart contract?

• The semilunar valve close

• The semilunar valve open

• The atrioventricular valve open

Which valve action results from an increase in pressure in the atrial of the heart?

• The opening of the semilunar valve

• The closing of the atrioventricular valve

• The opening of the atrioventricular valve

Where does the sino-atrial node, which generates the electrical impulses that coordinate heart-muscle contracted is located in?

• Left atrium

• Right atrium

• Septum

Right atrium and ventricle are separated from the left atrium and ventricle by______________

• AV node

• SA node

• Septum

Where do aorta pump oxygenated blood?

• Lungs

• Whole body

• Brain

What is the function of SA node?

• Spread impulse to both atrium

• Generate electrical impulse

• Spread impulse to AV node

How long does impulse delayed at AV node

• 0.01s

• 0.1s

• 1.0s

• 0.001s