Lab Exam Flashcards
(11 cards)
what are the three main components of the circulatory system
heart
blood vessels
blood
the right side of the heart pumps and receives _______ blood
deoxygenated blood
the left side of the heart pumps and receives ________ blood
oxygenated
what is systole
when the heart muscle contracts and the chamber pumps blood (lubb)
what is diastole
when the heart relaxes and fills with blood
what are the four valves of the heart
2 atrioventricular (AV) valves 2 semi-lunar valves
what causes the lubb sound
contraction of the av valves
what causes the dumb sound
closing of the av valves
what is a heart murmur
a hissing sound caused by the back flow of blood through a valve
what is the SA node and where is it located?
the SA node conducts electrical impulses and makes the heart beat (natural pacemaker)
located in the top of the right atrium
what is the innermost layer of a blood vessel called
endothelium
