The "lub" sound of the "lub-dub" heartbeat is due to what?Multiple Choicethe closing of the AV valvesthe closing of the semilunar valvesthe right atrium contractingthe left atrium contractingthe relaxation of both atria

What causes the lubb-dubb sound of a heartbeat, as heard through a stethoscope?Multiple choice question.the rush of blood out of the ventricles and into the arteriesthe contraction of the atria and ventriclesthe vibrations in heart tissue as blood flow is slowed when valves close

A doctor listening to the heartbeat through a stethoscope hears two sounds, lub and dub.How are these two sounds produced?

Second heart sound comes at :Lubb – Start of Ventricular systoleLubb  – Start of Ventricular diastoleDubb  – Start of Atrial  diastoleDubb – Start of Joint  diastole

When the first heart sound is heard, what is occuring with the heart valves?Multiple ChoiceThe semilunar valves are closing.The AV valves are opening.The semilunar valves are opening.The AV valves are closing.

Describe what causes the lub-dub soundyou hear when you listen to your heart.2 Describe the cause of the followingvalve conditions:a stenosisb regurgitation or insufficiencyc prolapse.3 Describe the function of the pericardiumsac that surrounds the heart.4 Describe the link betweenatherosclerosis and coronary heartdisease.5 Identify two things you could do toensure your circulatory system stayshealthy.6 Describe why the heart muscle becomesdamaged during a heart attack.7 Describe how the function of thepericardium is affected when it fills withfluid during an infection.7. 8 Check your learning