Lab Quiz #3 Flashcards
what is a plethysmograph?
an instrument used to measure changes in the size of organ or the amount of blood moving through it
how does cold effect the amplitude?
it decreases
does the amplitude increase or decrease right after exercise?
it decreases
what happens to the heart rate immediately after exercise?
it increases
what equipment do we use to test volume pulse?
1) plethysmograph
2) powerlab computer software
what does more blood volume lead to?
more pressure and more flow
what does less blood volume lead to?
less pressure and less flow
what is the systolic pressure created from?
as the blood flows through the occluded artery
why is an artery smaller in diameter than veins?
because there is more pressure and a thicker tunica media
why does blood move faster in arteries than veins?
they have more pressure, they’re closer to the heart and cause the blood to move at a much higher rate
what happens to the heart rate wen the recording returns to normal?
it drops back down to normal rate
why does the heart increase slightly after the person stands up?
because of activity
what else does the factors that affect volume pulse effect?
arterial blood pressure
how does the cold affect peripheral blood vessels?
vasoconstriction in decreased temp
what is diastolic pressure?
the minimum pressure during diastole.
what is the first sound heard with the stethoscope?
the systolic pressure
what artery is the pulse customarily used?
radial artery
why does the amplitude decrease after exercise?
less blood flow through fingers so that more blood can go to muscles
what happens to the systolic pressure immediately after exercise?
it increases
does the amplitude increase or decrease when the person stands?
it temporarily increases
what is a sphygmomanometer?
an instrument used to measure peripheral blood pressure
what does the change in volume pulse amplitude and heart rate indicate about changes in the volume of blood flowing through the finger?
a decrease in amplitude=a decrease in blood flow
what are some other locations to take a pulse?
1) carotid artery (side of neck)
2) temporal artery (temple, above and outside of the eye)
3) brachial artery (inner side of biceps)
4) popliteal artery (behind knee)
which vessels does blood move the slowest?
capillaries
what is the formula to calculate heart rate from pulse rate?
beat/elapsed time (seconds) X 60 seconds/1 minute= heart rate (bpm)
what is systolic pressure?
the peak pressure during ventricular systole
what happens to diastolic pressure immediately after exercise?
it increases
what does the point of complete cessation of sound indicate?
that the artery is no longer compressed even at the lowest pressure
what is the purpose of getting a volume pulse?
it reflects the blood flow in peripheral circulation
what happens to heart rate a few minutes after exercise?
it returns to normal
which vessels does blood move fastest?
arteries
how does heat effect the amplitude?
it increases
does the heart rate increase or decrease after exercise?
increases
what factors does the magnitude of the change in peripheral blood volume effect volume pulse? (4) (TBPE)
1) temperature
2) body position
3) physical activity
4) emotional state
what happens to a persons heart rate after the person stands up?
it increases slightly
when a person is standing what increases and from what?
hydrostatic pressure from gravity
what happens to the systolic pressure a few minutes after exercise?
it returns to normal
what is the amplitude?
the height of the volume pulse recording
what instrument do you use to measure peripheral blood pressure?
a sphygmomanometer
what is the pulse pressure?
the difference between systolic and diastolic pressure
how does the amplitude of the volume pulse for the cooled finger compare to volume pulse for the recording at room temp?
the decrease in amplitude= peripheral vasoconstriction
as the pressure continues to decrease after systolic pressure what happens to the sound?
it should become louder, then dull and muffled and then cease
what does the cessation of sound determine?
the diastolic pressure
why does blood move the slowest in capillaries?
it needs time to unload
explain all the changes in terms of homeostasis?
body returns the heart rate back to normal
what can the dicrotic notch be in some people?
in some people very distinct and in others absent
which is smaller in diameter an artery or vein?
artery
what happens to diastolic pressure a few minutes after exercise?
it returns to normal
what is the dicrotic notch caused by?
the elastic recoil of an artery after the closure of the aortic valve
what equipment do you need to measure peripheral blood pressure?
a sphygmomanometer and stethoscope
what is a volume pulse?
a change in blood volume for each cardiac cycle
