Heart Structure and Function Guided Notes Name:__________________________

Do NowWrite down 1-3 questions about how your heart works.

Cardiovascular SystemWhat is the major function of the cardiovascular system?

What is the heart’s role in this system, and what are the other major components?

Heart Size and Location

Heart Layers. Describe the location and function of the three layers.

Pericardium –

Myocardium –

Endocardium –

Describe the heart size, location, and tilt.

What is pericarditis?

Cardiac circulationCardiac vessels cover the outer surface of the heart and supply the heart muscle itself with blood.Heart disease (___________________________) occurs when the aorta or cardiac arteries

Heart Anatomy (Frontal Section)

The heart is a double pump• The ____________________ of the heart receives

________________________________________

________________________________________ and

pumps it to the _____________________

________________________________________

• The ______________________ of the heart receives

_________________________________________

_________________________________________ and

pumps it to the _____________________

______________________________________

The heart has four chambers Each side has an ___________________________________________________ and a _____________

____________________________________________________________

Blood collects in atria while ventricles contract.

Then, as ventricles relax, atria contract slightly and ventricles refill.

Two sides of heart contract and relax simultaneously.

Flow of Blood

The walls of the ventricles are much thicker than that of the atria? Why?

Look at the diagram – how does the left ventricle differ from the right? What is the reason for the difference?

Use the diagram to determine the flow of blood

through the heart and body.

Vena cava

Vena cava

Heart valves ensure unidirectional flow of blood

_________________________________ (pulmonary and aortic)• forced open when ventricles contract• closed when ventricles relax

Prevent backflow from ______________________ to _____________________

In what stage of the cardiac cycle is the heart shown above? How do you know?

Heart SoundsNormal hearts make the sound:

LUB-dup LUB-dup LUB-dup

The “LUB” is caused by the closing of the _________________________________.

The “dup” is caused by the closing of the _________________________________.

Heart murmurs are __________________________heart sounds. • In children, these are often benign.• In adults, they usually indicate a problem – often, the _____________________________________

_______________________________________.

Why is it a problem if the valves don’t function properly?

HOMEWORKMonday – Ex 20, Read Ch 11Wednesday – Present questionsQuiz next Wednesday or Friday

valves (tricuspid and mitral)

• hang open when the ventricles are filling

• forced closed when the ventricles contract

• Anchored by ___________________________

Prevent backflow from ____________________

to ______________________________