Heart Cardiac Cycle Flashcards

The cardiac cycle ________.

A) represents all of the events of the heart during one heartbeat

B) is a graph of pressure changes in the heart as it contracts

C) is a graph showing the timing of heart valve closure

D) is a graph of electrical activity of the heart

By convention, the cardiac cycle graphs the events of the left side of the heart. How would the graphs change if we looked, instead, at the right side of the heart?

A) Both the pressure and volume changes in the right ventricle would be much less, while other events would be

about the same.

B) Pressure in the right ventricle would be much less, and all other events would be about the same.

C) There would be no change in any of the events.

What does the cardiac cycle reveal about the opening and closing of the heart valves?

A) There are no times when all four heart valves are closed.

B) There are times when all four heart valves are open.

C) The AV valves close first, then the semilunars open and close, then the AV valves open.

D) The AV valves open, then the semilunars open, then the AV valves close, followed by closure of the semilunars.

The First heart sound heard during the cardiac cycle is associated with

A) closure of the semilunar valves

B) opening of the AV valves

C) closure of the AV valves

D) opening of the semilunar valves

In comparing the volume of blood moved from atria to ventricles when the atria contract with the volume of blood ejected from the heart when the ventricles contract, we observe that ...

A) atrial contractions move more blood into the ventricles than ventricles eject

B) atrial contractions move as much blood into the ventricles as ventricles eject

C) atrial contractions move less blood into the ventricles than ventricles eject

Heart murmurs ___

A) often indicate problems with heart valves, can be used to diagnose failure of the heart valves to close tightly, and can be used to diagnose constricted heart valves

B) can be used to diagnose failure of the heart valves to close tightly

C) often indicate problems with heart valves

D) can be used to diagnose constricted heart valves

The first heart sounds are best heard ________.

A) just beneath the xiphoid process of the sternum

B) in the second intercostal spaces at the sternal margins

C) directly over the body of the sternum, just inferior to the sternal angle

D) in the 5th intercostal spaces, at various distances from the sternal margins

The first of the two numbers measured when taking the blood pressure represents ________.

A) systolic pressure B) diastolic pressure C) isovolumetric pressure

When taking blood pressure, the sounds heard when the pressure cuff is released are due to ________

A) smooth blood flow

B) the smaller than normal diameter of the blood vessel

C) the larger than normal diameter of the blood vessel

D) turbulent blood flow

The mean arterial pressure for a patient whose blood pressure is 110/80 is ________.

A) 95 mm Hg B) 80 mm Hg C) 90 mm Hg D) 30 mm Hg

Venous pressure ________.

A) is much lower than arterial pressure

B) may be measured directly with a sphygmomanometer and pressure cuS

C) is usually the same in veins as in their corresponding arteries

D) is not affected by external factors such as muscle activity

During moderate exercise, ________.

A) heart rate remains the same or decreases

B) blood pressure remains at pre-exercise levels

C) blood pressure decreases

D) heart rate and blood pressure increase

The term systole refers to ________.

A) atrial depolarization B) ventricular contraction

C) atrial contraction D) ventricular depolarization

Assume that the heart is beating at 70 beats per minute. What is the approximate length of the cardiac cycle?

A) 0.75 sec B) 0.92 sec C) 0.86 sec D) 0.80 sec

The pressure generated during contraction of the atria is ________ that generated during contraction of the ventricles.

A) the same as

B) less than

C) greater than

The QRS complex of the electrocardiogram begins ________.

A) just after ventricular contraction begins

B) just prior to ventricular contraction

C) just prior to atrial contraction

D) well after ventricular contraction

Heart sounds are associated with ________.

A) closure of the AV valves

B) closure of the semilunar valves

C) turbulent blood flow, closure of the AV valves, and closure of the semilunar valves

D) turbulent blood flow

The semilunar valves are forced open when ________.

A) ventricular systole begins

B) ventricular pressure exceeds the pressure in the large arteries leaving the heart

C) atrial contraction occurs

D) ventricular diastole begins

Is it possible to determine blood pressure from a cardiac cycle graph? Why or why not?

A) Yes, but only systolic pressure can be read.

B) Yes, both systolic and diastolic pressures can be read.

C) No, blood pressure must be measured using a pressure cuS and stethoscope.

D) Yes, but only diastolic pressure can be read.

Which phase of the cardiac cycle is longest?

A) ventricular systole B) isovolumetric contraction

C) ventricular diastole D) isovolumetric relaxation

Pulse pressure ________.

A) can be palpated easily under the chin

B) refers to alternating surges of pressure in an artery

C) is the large difference between the apical and radial pulses

D) is the difference between systolic and diastolic pressure

By taking a pulse you can determine ________.

A) strength of the pulse

B) pulse rate (normally equal to heart rate)

C) regularity of the pulse

D) pulse rate, regularity of the pulse, and strength of the pulse

Blood pressure is ________.

A) a number that is the average of the systolic and diastolic pressures

B) the pressure of the blood against the blood vessel walls, generally measured in veins, and a number that is the average of the systolic and diastolic pressures

C) the pressure of the blood against the blood vessel walls

D) generally measured in veins

If you cut yourself and blood spurts rhythmically from the injury, you have probably cut ________.

A) a capillary B) a vein

C) many veins and capillaries D) an artery

How is the degree of oxygenation of the blood related to skin color?

A) when the blood is oxygen-rich, skin will be pale or white

B) when the blood is oxygen-poor, skin will be pink or red

C) when the blood is oxygen-rich, skin will be pink or red

When the upper limb is raised, and the pressure cuff inflated, blood flow to the forearm is stopped, and the hand ________.

A) First turns red, then becomes white B) Flushes red

C) has a blue color D) turns very pale