AR 3. Retrieval quiz Mon 18 Nov

Which of the following structures prevents backflow of blood from the left ventricle to the left atrium?

• Tricuspid valve

• Pulmonary valve

• Mitral valve

• Aortic valve

Where does oxygenated blood enter the heart?

• Right atrium

• Left atrium

• Right ventricle

• Left ventricle

What is the correct order of blood flow through the heart?

• Right atrium → Right ventricle → Lungs → Left atrium → Left ventricle

• Left atrium → Left ventricle → Lungs → Right atrium → Right ventricle

• Left ventricle → Right atrium → Lungs → Right ventricle → Left atrium

• Right ventricle → Right atrium → Lungs → Left ventricle → Left atrium

During the cardiac cycle, what occurs during ventricular systole?

• The ventricles relax and fill with blood

• The ventricles contract and pump blood into the arteries

• The atria contract and push blood into the ventricles

• The atria relax and fill with blood

Which structure initiates the cardiac impulse that triggers the heartbeat?

• Atrioventricular (AV) node

• Sinoatrial (SA) node

• Bundle of His

• Purkinje fibers

What happens to blood pressure when the arteries become narrower?

• Blood pressure decreases

• Blood pressure remains the same

• Blood pressure increases

• Blood pressure stops completely

Which part of the heart receives deoxygenated blood from the body?

• Left atrium

• Right atrium

• Left ventricle

• Right ventricle

What is the function of the aorta?

• To carry deoxygenated blood from the heart to the lungs

• To carry oxygenated blood from the heart to the body

• To carry blood from the lungs to the heart

• To carry blood between the atria

Which statement about the cardiac impulse is true?

• It originates in the Purkinje fibers

• It spreads from the SA node to the AV node

• It does not involve the bundle of His

• It only occurs during ventricular systole

What does the term “diastolic blood pressure” refer to?

• The pressure in the arteries when the heart beats

• The pressure in the arteries when the heart relaxes

• The maximum pressure in the veins

• The pressure in the heart chambers during contraction