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24 terms

Ch 11: The Cardiovascular System

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electrocardiogram
a recording of the electrical activity of the heart
P wave
the period during which the atria are depolarizing
T wave
the period during which the ventricles are repolarizing
QRS wave
the period during which the ventricles are depolarizing, which proceeds their contraction
Bradycardia
an abnormally slow heartbeat, that is below 60 beats per minute
Tachycardia
an abnormally rapid heartbeat, over 100 beats per minute
heart block
damage to the AV node, totally or partially releasing the ventricles from the control of the sinoatrial (SA) node
Angina pectoris
Chest pain, resulting from ischemia of the myocardium
circle of Willis
an anastomosis that allows communication between the posterior an anteriior blood supplies of the brain
umbilical vein
the vessel carrying the oxygen and nutrient-rich blood to the fetus and placenta
ductus venosus
the shunt that allows most fetal blood to bypass the liver
anterior cerebral artery, middle cerebral artery
two pairs of arteries, arinsing from the internal carotid artery
basilar artery
the posterior cerebral arteries, serving the brain, arise from here
ductus arteriosus
fetal shunt between the aorta and the pulmonary trunk that allows the lungs to be bypassed by the blood
foramen ovale
opening in the interatrial septum that shunts fetal blood from the right to the left atrium, thus bypassing the fetal lungs
pulse
expansion and recoil of an artery during heart activity
blood pressure
pressure exerted by the blood against the blood vessel walls
cardiac output, peripheral resistance
(2) Factors related to blood pressure
constriction of arteriosa
event primarily responsible for peripheral resistance
systolic blood pressure
Blood pressure during heart contraction
diastolic blood pressure
blood pressure during heart relaxation
over arteries
site where blood pressure determinations are normally made
pressure points
points at the body surface where the pulse may be felt
sounds of Karotkoff
sounds heard over a blood vessel when the vessel is partially compressed