Heart Sounds and Valves

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Questions and Answers

What is the usual description of the sounds made by the heart?

Beat beat, beat beat, beat beat

Thud thud, thud thud, thud thud

Lub dub, lub dub, lub dub (correct)

Dub lub, dub lub, dub lub

What happens to the blood in the right atrium?

It goes to the right ventricle (correct)

It goes directly to the lungs

It goes to the left ventricle

It stays in the right atrium

What is the name of the valve that allows blood to flow from the right atrium to the right ventricle?

Pulmonary valve

Mitral valve

Aortic valve

Tricuspid valve (correct)

What happens to the blood in the left atrium?

It goes to the left ventricle Signup and view all the answers

Why is it possible for blood to be in two places at once in the heart?

Because blood is constantly moving through the heart Signup and view all the answers

What is the sequence of blood flow in the heart?

Right atrium, right ventricle, lungs, left atrium, left ventricle Signup and view all the answers

What is the purpose of the valves in the heart?

To allow blood to flow between chambers Signup and view all the answers

What is the significance of the diagram of the heart used in this explanation?

It exaggerates the valves to show their role in the heart sounds Signup and view all the answers

Which valve separates the left atrium from the left ventricle?

Mitral valve Signup and view all the answers

What happens to the tricuspid and mitral valves when the ventricles are full of blood?

They jam up Signup and view all the answers

What represents the correct flow of blood?

White arrows Signup and view all the answers

What happens to the aortic and pulmonary valves when the mitral and tricuspid valves are open?

They close down Signup and view all the answers

What is the noise caused by the tricuspid and mitral valves snapping shut?

Lub Signup and view all the answers

What is the term sometimes used to describe the first heart sound?

S1 Signup and view all the answers

When do the pulmonic valve and the aortic valve open?

When the tricuspid and mitral valves snap shut Signup and view all the answers

What happens to the blood when the valves snap shut?

It is blocked from flowing back Signup and view all the answers

What represents the incorrect flow of blood?

Black arrows Signup and view all the answers

What is the term used to describe the noise caused by the pulmonic valve and the aortic valve snapping shut?

Dub Signup and view all the answers

What happens to the valves in the heart when the ventricles finish squeezing?

They snap shut to prevent backflow Signup and view all the answers

What is the term for the sound produced by the snapping shut of the pulmonic and aortic valves?

Dub Signup and view all the answers

What happens to the blood during the time period between 'lub' and 'dub'?

It squeezes out of the ventricles into the body Signup and view all the answers

What is the term for the period of time when blood is refilling from the atriums into the ventricles?

Diastole Signup and view all the answers

What is the sequence of events in the heart cycle?

Ventricles squeeze, pulmonic and aortic valves snap shut, tricuspid and mitral valves open Signup and view all the answers

What is the term for the first heart sound?

S1 Signup and view all the answers

What is happening in the heart during the time period when you hear 'lub'?

The pulmonic and aortic valves are snapping shut Signup and view all the answers

What is the period of time when blood is being pumped out to the body?

Systole Signup and view all the answers

Study Notes

Heart Sounds

The heart produces sounds described as "lub dub, lub dub, lub dub" due to the opening and closure of valves.
These sounds can be broken down into two distinct noises: "lub" and "dub".

Heart Valves

The heart has four valves: tricuspid, pulmonary, mitral, and aortic.
The tricuspid valve separates the right atrium from the right ventricle.
The pulmonary valve separates the right ventricle from the pulmonary artery.
The mitral valve separates the left atrium from the left ventricle.
The aortic valve separates the left ventricle from the aorta.

Blood Flow

Blood flows from the right atrium to the right ventricle through the tricuspid valve.
Blood flows from the left atrium to the left ventricle through the mitral valve.
Blood flows from the right ventricle to the lungs through the pulmonary valve.
Blood flows from the left ventricle to the rest of the body through the aortic valve.

Valve Function

The tricuspid and mitral valves open to allow blood to flow from the atria to the ventricles.
The pulmonary and aortic valves open to allow blood to flow from the ventricles to the lungs and the rest of the body, respectively.
The valves close to prevent backflow, making a noise when they do.

Heart Sounds and Valve Closure

The "lub" sound is produced when the tricuspid and mitral valves snap shut.
The "dub" sound is produced when the pulmonary and aortic valves snap shut.
The sounds are referred to as S1 (first heart sound) and S2 (second heart sound).

Blood Flow Cycle

The heart cycle consists of systole (contraction) and diastole (relaxation).
Systole occurs when the ventricles squeeze blood out to the body, between the "lub" and "dub" sounds.
Diastole occurs when the ventricles refill with blood from the atria, between the "dub" sound and the next "lub" sound.