APS 2 Lab exam

Terms in this set (28)

Cardiac rhythmicity
spontaneous depolarization and repolarization that
occurs in a repetitive and stable manner within the cardiac muscle
Automaticity
ability of cardiac muscle cells (non-nodal cells) to
spontaneously generate APs in the absence of pacemaker initiated stimulation
Extrasystole
premature cardiac contraction that is independent of the normal rhythm and arises in response to an impulse outside the sino-atrial node
Vagal escape
characterized by a reduction in blood pressure due to
muscarinic stimulation which is then compensated for stimulation from the
sympathetic system to increase heart rate
ectopic pacemaker
excitable cell or group of cells that cause a
premature heart beat outside the normally functioning SA node in heart.
When can extrasystole be induced?
During cardiac diastole
What is the compensatory pause?
pause after an extrasystole that allows the
heart rhythm to resynchronise atrial and ventricular contraction.
In the auscultation method for blood pressure measurement, systolic pressure is
indicated by
The first detection of the sounds
In the auscultation method for blood pressure measurement, diastolic pressure is
indicated by
The disappearance of the sounds.
What is the basis for the sounds referred to as Korotkoff sounds
Turbulent blood flow.
I would expect that, together with a sphygmomanometer, the finger pulse detector
Could not be used to determine systolic pressure.
I would expect that the systolic blood pressure measured with the arm raised above the head would be
Lower than that measured with the arm in its normal position
The terms systole and diastole usually refer to the _______ and _______,
respectively, of the _______.
contraction; relaxation; ventricles
Which one of the following is responsible for generating the first heart sound
Closing of the AV valves.
Which one of the following is responsible for generating the second heart sound?
Closing of the semilunar valves.
Heart murmurs result from defective
Heart valves.
arterial systolic pressure is the pressure in the artery at
The highest pressure reached during the cardiac cycle
The arterial diastolic pressure is the pressure in the artery at
The lowest pressure reached during the cardiac cycle
Blood flow in the arterial system during diastole is
Driven by the elastic recoil of the major arteries.
The integrated signal obtained from the finger pulse transducer
Provides an indication of finger blood volume.
Would you expect that the radial pulse would be felt:
After the brachial pulse
At rest, the heart rate is most affected by which one of the following
Parasympathetic (vagal) nervous innervation.
. During exercise, the heart rate is most affected by which one of the following:
Increased sympathetic nervous innervation.
At rest, which one of the following could not affect stroke volume
Increased parasympathetic (vagal) nervous innervation.
Which of these statements about stroke volume is not true for severe sustained
exercise?
Increased stroke volume contributes to increased delivery of oxygen and removal of carbon dioxide and acid from the exercising muscles.
. During exercise, there is a marked increase in blood flow to which one of the following:
Skeletal muscles (in total).
Which one of the following do you think would alter the most in conditions where
heart rate is increased?
TP interval
During exercise, cardiac output increases. Which one of the factors below does
not contribute to this increase?
Vasoconstriction in the exercising muscles.
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