Practice Q's Flashcards
more than half of the delay of signal in heart occurs in which area?
AV node
in a typical ekg, which wave occurs at beginning of atrial contraction
p wave
what event is not normally seen on an ekg?
atrial repolarization
what is the direction of the 3 bipolar leads?
1 = 0 degrees 2 = 60 degrees 3 = 120 degrees
which bipolar lead is connected to both arms?
lead I
which bipolar lead has the highest amplitude for the normal qrs wave? and what is the reason to describe this?
lead II because it is most parallel to the vector for the depolarization qrs wave
what is the mean electrical axis of the normal ventricles
59
what conditions result in tachycardia
- toxic conditions of the heart
- increased body temp.
- sympathetic nerve stimulation
an ekg with all normal waves present but they are spread far apart
sinus bradycardia
an ekg with P waves that don’t always have an associated QRS complex
AV block
circus mvts are the basis of
heart fibrillation
84% of blood is in the
systemic circulation
64% of systemic blood is found in
veins
blood flow resistance is inversely proportional to which of the following? viscosity vessel diameter density 1 and 3
vessel diameter
if rate of blood flow thru entire system is 100mL/sec and pressure difference between systemic arteries and veins is 100mmHg, what is the total peripheral resistance?
1 PRU
Reynolds number is a measure of ?
tendency for turbulence
what is the viscosity of blood with a hematocrit of 38-42?
3.0
veins are about ____ distensible than that of arteries
8x more distensible
vascular compliance is _____ to volume increase and ________ to pressure
directly
indirectly related
what is the measure of the ease with which a hollow viscus may be distended?
compliance
what is true of compliance and elastance, when there is a greater amount of elastic tissue in a blood vessel
lower compliance
greater elastance
high resistance is what group of vessels results in a disappearance in the phasic pressure pattern such seen in the aorta?
systemic arterioles
which forces tends to move fluid inward at the arterial end of the capillary?
- capillary hydrostatic pressure
- neg. interstitial free fluid pressure
- plasma colloid osmotic pressure
- interstitial fluid colloid osmotic pressure
- plasma colloid osmotic pressure
capillary hydrostatic pressure
blood pressure going into capillary
push fluid out of arterioles