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Chapter 44

LIFESCI 2 Chapter Notes - Chapter 44: Inferior Vena Cava, Superior Vena Cava, Pulmonary Artery


Department
Life Sciences
Course Code
LIFESCI 2
Professor
Esdin Joseph
Chapter
44

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Chapter 44 Notes
The cardiovascular system
o A closed system that consists of the heart, blood vessels, and the
blood
The heart pumps blood
Blood vessels provide the path for the blood to travel
Blood carries nutrients and picks up wastes
o Pulmonary circuit
Delivers deoxygenated blood from the heart to the lungs
o Systematic circuit
Delivers oxygenated blood from the heart to the body
Chambers of the heart
o Atriums:
Receiving chambers
Right atrium
Left atrium
o Ventricle:
Pumping chambers
Right ventricle
Left ventricle
Valves of the Heart
o Tricuspid valve
Connects right atrium to right ventricle
o Bicuspid valve
Connects left atrium to left ventricle
o Pulmonary semilunar valve
Connects right ventricle to the pulmonary trunk
o Aortic semilunar valve
Connects left ventricle to aorta
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2
o Pressure from blood and contraction of heart causes valves to
open and close
Blood Vessels of the Heart
o Superior vena cava
Brings blood from anything above the diaphragm to the
right atrium
o Inferior vena cava
Brings blood from anything below the diaphragm to the
right atrium
o Pulmonary trunk
Splits in left pulmonary artery and right pulmonary artery
that goes to respective lungs
Carries deoxygenated blood from the right ventricle to the
lungs
o Pulmonary veins
Two on each side of the heart
Bringing enriched blood back into the heart to the left
atrium
o Aorta
Major blood vessel that branches to deliver blood to the
body
Blood from the left atrium enters the left ventricle and is
pumped through the aorta
Ventricular Diastole
o Aortic and pulmonary valves are closed
o Bicuspid and tricuspid valves are open
Ventricular Systole
o Aortic and pulmonary valves are open
o Bicuspid and tricuspid valves are closed
Electrical Activity of the Heart
o The heart is a cardiac muscle tissue that is constantly contracting
(heart beat)
Q: how does the heart contract?
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