The Cardiac Cycle Phase 2 - Isovolumetric Ventricular Contraction

The video explores the isovolumetric contraction phase of the cardiac cycle, where the ventricles contract without changing the blood volume. It explains the role of the EKG, particularly the QRS complex, in showing ventricular depolarization. The video also discusses the pressure dynamics within the heart, the closure of heart valves, and the resulting heart sounds. It concludes with a brief mention of the next phase, ejection.

What is the primary function of the right ventricle during the cardiac cycle?

• To pump oxygenated blood to the body

• To pump deoxygenated blood to the lungs

• To receive blood from the lungs

• To receive blood from the body

What does the term 'isovolumetric' refer to in the context of isovolumetric contraction?

• The constant blood pressure

• The constant blood volume

• The change in blood volume

• The change in blood pressure

Which part of the EKG represents the depolarization of the ventricles?

• P wave

• T wave

• QRS complex

• U wave

What happens to the left atrioventricular valve during isovolumetric contraction?

• It bulges into the ventricles

• It closes to prevent backflow

• It remains open

• It opens to allow blood flow

Why does the aortic valve remain closed during the initial phase of isovolumetric contraction?

• Because the pressure in the aorta is higher than in the ventricle

• Because the pressure in the ventricle is higher than in the aorta

• Because the aortic valve is damaged

• Because the ventricle is not contracting

What causes the 'c wave' in atrial pressure during isovolumetric contraction?

• The opening of the aortic valve

• The closure of the atrioventricular valve

• The contraction of the atria

• The relaxation of the ventricles

What sound is associated with the closure of the atrioventricular valves?

• The 'lub' sound

• The 'click' sound

• The 'dub' sound

• The 'whoosh' sound