Understanding Heart Sounds and Blood Flow

The video tutorial explains the sounds made by the heart, commonly described as 'lub-dub'. It details the anatomy of the heart, including its chambers and valves, and how blood flows through them. The tutorial describes how the opening and closing of valves produce heart sounds, known as S1 and S2, and explains the phases of the cardiac cycle, systole and diastole, in relation to these sounds.

What are the typical sounds made by the heart?

• Tick-tock

• Lub-dub

• Ping-pong

• Snap-crackle

Which chamber does blood enter after returning from the lungs?

• Right atrium

• Left ventricle

• Right ventricle

• Left atrium

Which valve separates the left atrium from the left ventricle?

• Tricuspid valve

• Pulmonary valve

• Mitral valve

• Aortic valve

Which valves are open when the ventricles are full of blood?

• Tricuspid and mitral valves

• No valves

• Pulmonary and aortic valves

• All valves

What is the role of the pulmonary valve?

• To open during diastole

• To separate the left atrium and ventricle

• To prevent backflow into the right ventricle

• To allow blood into the left atrium

What happens when the tricuspid and mitral valves snap shut?

• The heart makes a 'dub' sound

• The heart makes a 'lub' sound

• Blood flows into the atria

• Blood flows into the ventricles

What prevents the backflow of blood in the heart?

• The contraction of the heart muscles

• The pressure of the blood

• The shape of the heart

• The closing of the valves

What is the second heart sound referred to as?

• S2

• Dub

• S1

• Lub

What is the term for the phase when blood is squeezed out to the body?

• Diastole

• Systole

• Dub

• Lub

During which phase does blood refill from the atria into the ventricles?

• Systole

• Diastole

• Lub

• Dub