Chapter 20 Interactive Notes – The Heart
The Heart
• Learning Outcomes
o 20-1 Describe the anatomy of the heart, including vascular supply and pericardium structure, and trace the flow of
blood through the heart, ide
...
Chapter 20 Interactive Notes – The Heart
The Heart
• Learning Outcomes
o 20-1 Describe the anatomy of the heart, including vascular supply and pericardium structure, and trace the flow of
blood through the heart, identifying the major blood vessels, chambers, and heart valves.
o 20-2 Explain the events of an action potential in cardiac muscle, indicate the importance of calcium ions to the
contractile process, describe the conducting system of the heart, and identify the electrical events associated with a normal
electrocardiogram.
o 20-3 Explain the events of the cardiac cycle, including atrial and ventricular systole and diastole, and relate the heart
sounds to specific events in the cycle.
o 20-4 Define cardiac output, describe the factors that influence heart rate and stroke volume, and explain how
adjustments in stroke volume and cardiac output are coordinated at different levels of physical activity.
An Introduction to the Cardiovascular System • The Cardiovascular
System consists of:
o A pump (the __heart________moves ~8000 liters/day) o A
conducting system (____blood vessels_________________) o A
fluid medium (__blood_____________)
• The ___pulmonary________________ Circuit o Carries blood to and
from gas exchange surfaces of lungs
• The ___systemic______________Circuit o Carries blood to and from
the body o Blood alternates between pulmonary circuit and systemic
circuit
Three Types of Blood Vessels
1. ____arteries______________ carry blood ___away________ from the heart
2. veins______________carry blood __to_____ the heart
3. _capillaries_____________(aka exchange vessels) are networks between _arteries________ and
_veins__________
Four Chambers of the Heart
1. ___right atrium___________________________ collects blood from systemic circuit
2. ___right ventricle___________________________ pumps blood to pulmonary circuit
3. ________left atrium_______________________ collects blood from pulmonary circuit 4. _____left
ventricle_________________________ pumps blood to systemic circuit
20-1 Anatomy of the Heart
The Heart o Great veins and arteries at the
____base_________ o Pointed tip is
___apex___________ o Surrounded by ___
pericardial__________ sac o Sits between two
pleural cavities in the
__ mediastinum________________
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