Download Heart Structure and Function Guided Notes

Heart Structure and Function Guided Notes
Name:__________________________
Do Now
Write down 1-3 questions about how your heart works.
Cardiovascular System
What 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
Describe the heart size,
location, and tilt.
Heart Layers.
Describe the location and function of the three layers.
Pericardium –
What is pericarditis?
Myocardium –
Endocardium –
Cardiac circulation
Cardiac 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
Use the diagram to determine the flow of blood
through the heart and body.
Vena cava









Vena cava
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?
Heart valves ensure unidirectional flow of blood
valves (tricuspid and mitral)
•
hang open when the ventricles are filling
•
forced closed when the ventricles contract
•
Anchored by ___________________________
Prevent backflow from ____________________
to ______________________________
_________________________________ (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 Sounds
Normal 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?
HOMEWORK
Monday – Ex 20, Read Ch 11
Wednesday – Present questions
Quiz next Wednesday or Friday