External features of the heart include
Internal features of the heart include
Select the correct order of the heart wall's 3 layers from outside of the heart to inside of the heart
epicardium -> endocardium -> myocardium
myocardium -> epicardium -> endocardium
epicardium -> myocardium -> endocardium
endocardium -> myocardium -> epicardium
endocardium -> epicardiium -> myocardium
The right and left ventricles are receiving chambers that collect blood
The ventricles are discharging chambers.
Select the characteristics of the right ventricle
wall is 3x thicker
crescent shaped cavity
less wall thickness
cavity is circular
low pressure pump
high pressure pump
squeezes blood against the opposite ventricle as pumping action
squeezes blood like fist and apex curls up
List the characteristics of the left ventricle
wall 3x thicker
squeezes blood against opposite ventricle
The epicardium layer of the heart wall consists of and loose connective tissue. The myocardium layer of the heart wall consists of and connective tissue. The endocardium layer of the heart wall consists of and loose connective tissue.
The atrioventricular (AV) valves or cuspid valves prevent backflow from the into the .
Semilunar valves prevent backflow from to .
The following relates to which valves: upon contraction, closed flaps are held in place by chordeae tendinae that are attached to papillary muscles.
The following relates to which valves: upon contraction, pressure increases, flattening the pockets and opening the valve.
Upon relaxation, AV valves open
close( open, close ) and back flow from vessels close
open( close, open ) semilunar valves.
The pathway of the heart begins at the superior and inferior vena cava, and continues to the , , , , pulmonary trunk, , lungs, , , , , , , body and back to the vena cava.
The pulmonary circuit involves the left side of the heart.
The systemic circuit involves the left side of the heart.
The coronary circuit is the shortest one in the body and supply the tissues of the heart.
The conducting system conducts
modifies( conducts, modifies ) the heart beat whereas the autonomic nervous system modifies
conducts( modifies, conducts ) it. The sympathetic nervous system accelerates
slows down( accelerates, slows down ) the heart beat while the parasympathetic slows down
accelerates( slows down, accelerates ) the heart beat.
At the lungs, which exchange of gases occurs?
pulmonary arteries carry oxygen-poor blood and pulmonary veins pick up oxygen-rich blood
pulmonary arteries carry oxygen-rich blood and pulmonary veins pick up oxygen-poor blood
The is the cardiac center for the autonomic nervous system.
The path of impulse of the contraction is Purkinje fibers
right and left bundle
AV node( Purkinje fibers, SA node, AV bundle, right and left bundle, AV node ), AV node
right and left bundle
AV bundle( AV node, SA node, Purkinje fibers, right and left bundle, AV bundle ), right and left bundle
Purkinje fibers( right and left bundle, SA node, AV bundle, AV node, Purkinje fibers ), right and left bundle
AV node( right and left bundle, SA node, AV bundle, Purkinje fibers, AV node ), AV bundle
right and left bundle
AV node( AV bundle, SA node, right and left bundle, Purkinje fibers, AV node ).
An electrocardiogram (ECG) are the
electrical events that follow the contraction
electrical events that proceed the contraction
electrical events that occur at the same time as the contraction
The order of the electrical events of the ECG are
T wave, QRS complex, P wave
QRS complex, P wave, T wave
P wave, QRS complex, T wave
P wave, T wave, QRS complex
What occurs at the P wave?
depolarization of the ventricles signal for contraction, and repolarization of the atria
depolarization of atrium
What occurs at the QRS complex?
depolarization of the atrium
depolarization of the ventricles signal for contraction, repolarization of the atria
time for conduction from SA nodes to ventricles
What occurs at the T wave?
ventricular contraction (depolarization thru repolarization of ventrices)
The QT interval in the ECG is ventricular contraction, ie depolarization and repolarization of the ventricles
The PQ interval is the time for conduction from ventricles to SA nodes.
At systole, contraction
relaxation( contraction, relaxation ) occurs which includes isovolumetric ventricular relaxation
contraction( relaxation, contraction ) and ventricular ejection
relaxation( ejection, relaxation ).
At diastole, relaxation
contraction( relaxation, contraction ) occurs which includes isovolumetric ventricular contraction
relaxation( contraction, relaxation ) and ventricular relaxation
contraction( relaxation, contraction ).
Blood flowing thru the heart is controlled by increasing and decreasing pressure reflecting contraction and relaxation.
Which event does the following describe?: QRS complex occurs, ventricles contract, atria relax, pressure rises in ventricles which causes the AV + semilunar valves close (2nd heart sound)
ventricular filling: late diastole
isovolumetric relaxation and ventricular filling: early diastole
Which event does the following describe?: low pressure, blood flowing through atria and ventricles, AV valves open, semilunar valves are closed
Which event does the following describe?: P wave occurs at 70% filling, and atria contract, AV valves close (1st heart sound), semilunar valve is closed, at this point ventricles are at their largest volume (end diastolic volume)
Which event does the following describe?: semilunar valves are closed, AV valves are closed, ventricles begin to relax and pressure in ventricles drops; blood flows back against cusps of semilunar valves and forces them closed. Blood flows into the relaxed atria
The first heart sound LUB occurs when
semilunar valves open
AV valves close
AV valves open
semilunar valves close
The second heart sound DUB occurs when
Murmurs occur when the two heart sounds are normal.
Stroke volume is calculated by ESV - EDV
Cardiac output is calculated by SV x HR