Week 4 Flashcards
Diastole
the ventricles relax and fill with blood
systole
the heart contracts and pumps blood from the ventricles to the pulmonary and systemic arteries
the first heart sound (S1)
results from the closure of the atrioventricular valves and indicates the beginning of systole.
Second heart sound (S2)
results from the closure of the semilunar valves and signals the end of systole.
third heart sound (S3)
due to the vibration of the ventricles that resist early rapid filling
fourth heart sound (S4)
due to the vibration of noncompliant ventricles when the when the atria contract and push blood into them
murmurs
gentle blowing and swishing sounds due to turbulent blood flow
the carotid artery pulse coincides with
ventricular systole
which cardiac alterations occur in pregnancy
an increase in cardiac output and decrease in BP
the jugular venous pressure is an indirect reflection of the
hearts efficiency as a pump
what is the appropriate position for the patient to be in when assessing for heart murmurs or extra heart sounds
rolled toward the left side
the semilunar valves separate the
ventricles from the arteries
a bruit heard in the carotid artery is caused by
turbulent blood flow. A blowing swishing sound that indicates atherosclerotic narrowing of the vessel
the ability of the heart to contract independently of any signals or stimulation is due to
automaticity
artereosclerosis
thickening and loss of elasticity in the artrial walls
the top of the heart is the
broader base
the bottom of the heart is the
apex
where is the apical pulse
at the fifth intercostal space, midclavicular line
what returns unoxygenated blood back to the right side of the heart
the superior and inferior vena cavae
what leaves the right ventricle and carries the venous blood to the lungs
pulmonary artery
what returns the freshly oxygenated blood to the left side of the heart
pulmonary veins
what carries the blood out of the heart and to the body
aorta
what is the tough, fibrous, double walled sac that surrounds and protects the heart
pericardium
what is the muscular wall of the heart that does the pumping called?
myocardium
what is the thin layer of endothelial tissue that lines the inner surface of the heart and chamber valves called?
endocardium
thin walled resevoir for holding blood
atrium
thick walled pumping chambers
ventricles
what heart valves separate the atria from the ventricles
the atrioventricular valves
the right AV valve is the?
tricuspid valve
the left AV valve is the
bicuspid (mitral) valve
when do the AV valves open?
during diastole to allow the ventricles to fill with blood
When do the AV valves close?
during systole (pumping) to prevent regurgitation of blood into the atria
where are the semilunar valves located?
between the ventricles and the pulmonary arteries
where is the pulmonic valve?
in the right side of the heart