In transmission of the impulses causing the heart to beat, the impulses pass from the Bundle of HIS to the:
Purkinje fibers of the ventricles
If an individual has a heart rate of 150, what is the amount of time it takes to complete one heart beat?
150/60 =.4 sec
As the heart rate increases, the time available for filling the ventricles of the heart, called diastolic filling, is
Decreased or shorten
What part of the ventricles contract first in the cardiac cycle?
Interventricular septum
Blood flows directly into the ventricles from the atria during
Early atrial systole and late ventricular diastole
Pressure in the atria is greater than pressure in the ventricles during:
Artrial systole and late ventricular diastole
Increasing the heart rate with no increase in venous return has limited effect on cardiac output because:
Reduces the heart ventrical
Stroke volume is increased by
Increased venous return resulting in increased end diastolic volume, empty ventricles decreased intra thoratic pressure
The first vessel(s) to branch from the aorta is (are) the
Coronary arteries
The “SA node” establishes the rate of the heart’s contraction because
The Av node slows down the rate but the Sa node still initiates a faster rate
Which of the following represents the correct sequence of parts through which blood moves in passing from the vena cava to the
lungs?
Right atrium, tricuspid valve, right ventricle, pulmonary valve, pulmonary trunk, pulmonary artery
(R-T-R-P-P_P)
One of the reasons that blood can not flow into the coronary arteries during late ventricular systole of the heart is that
Valve leaflets cover the coronary orifices during systole
Which of the following statements about the ventricles is true
pumping chambers ejects blood from the heart into blood vessels called arteries
On an “ECG” the spread of an impulse over the atria just prior to atrial contraction is represented by:
P wave
If the cardiac output is 5.4 liters/min. And the heart rate is 100 beats/min., what is the stroke volume?
5.4/100 =0.054
The atrioventricular valve that is on the same side of the heart as the origin of the pulmonary artery is named the
Tricuspid valve
Which of the following is a characteristic of cardiac muscle?
Involuntary, central located, cell fibers arranged in a branching network or syncytium
Blood can only flow into the ventricles when the ventricles:
Are relaxed or have less blood pressure than the atria
Starting at the coronary sinus, which one of the following structures listed is passed thirdly by a drop of blood ?
Pulmonary trunk
The auscultatory method of measuring blood pressure
Relies on hearing korotkoffs sound through a stethoscope
Which is FALSE concerning the right ventricle?
Revives oxygenated blood directly from the vena cava
If one heart beat lasts two thirds of a second, what would be the individual’s heart rate?
3/2=1.5 * 60= 90
The posterior surface of the heart is mostly formed by the:
Left ventricle
The first mixing of venous-type blood with arterial-type blood occurs in the fetal circulation where the:
Ducts venous meets the inferior vena cava
