Heart Flashcards
Norma, heart sounds are caused by:
Closure of the heart valves
Which events below do not occur when semilunar valves are open:
Ventricles are in diastole
Hemorrage with a large loss of blood causes:
Lowering of blood pressure due to change in cardiac output
Left ventricular wall of the heart is thicker than the right wall in order to:
Pump blood with greater pressure
Damage to the _____ is referred to as heart block.
AV node
The P wave of a normal electrocardiogram indicated:
atrial depolarization
Blood within the pulmonary veins returns to the:
left artium
Small muscle masses attached to the chordae tendinae are the:
papillary muscles
Term for pain associated with deficient blood delivery to the heart caused by transient spasm of coronary arteries is ___________.
angina pectoris
Term for pain associated with deficient blood delivery to the heart caused by transient spasm of coronary arteries is ___________.
angina pectoris
To auscultate the aortic semilunar valve, you would place your stethoscope in the ___________.
second intercostal space to the right of the sternum
The source of blood carried to capillaries in the myocardium would be the _________.
coronary arteries
The left ventricle of the heart is thicker than the right ventricle. This reveals that it ___________.
pumps blood against a greater resistance
The left ventricle of the heart is thicker than the right ventricle. This reveals that it ___________.
pumps blood against a greater resistance
Which does not influence heart rate?
- skin color
- age
- gender
- body temp
skin color
Which is the following is not an age related change affecting the heart?
Thinning of the valve flaps
If cardiac muscle is deprived of its normal blood supply, damage would primarily result from __________.
decreased delivery of oxygen
What would happen if the length of refractory period was the same as skeletal muscle cells?
tetanic contractions might occur, which would stop the heart’s pumping action
What would happen if the length of refractory period was the same as skeletal muscle cells?
tetanic contractions might occur, which would stop the heart’s pumping action
Norepi acts on the heart by _________.
causing a threshold to be reached more quickly
Norepi acts on the heart by _________.
causing a threshold to be reached more quickly
What would happen if vagal nerves to the heart were cut?
heart rate would increase 25 beats per minute
What would happen if vagal nerves to the heart were cut?
heart rate would increase 25 beats per minute
Foramen ovale connects what?
two atria in the fetal heart
Which vessel receives blood during right ventricular systole?
aorta and pulmonary trunk
AV node, Bundle of His and and SA node are all part of the ___________ system of the heart.
conduction
AV node, Bundle of His and and SA node are all part of the ___________ system of the heart.
conduction
Which vessel of the HEART RECIEVES BLOOD during right ventricle systole?
Pulmonary Trunk
The tricuspid valve is closed when the…
Ventricle is in systole
When viewing a dissected heart, discern the right and left ventricles by:
noticing the thickness of the ventricle wall
The AV valves are supported by chordae tendineae so that _____________ of the blood does not occur during ventricular _________.
regurgitation; contraction
The entire heart contracts as a unit or it does not contract at all, what is this a function of?
Myocardial cells
The myocardium layer, which contracts describes what?
The structure of the heart wall
Compared to skeletal muscle, cardiac muscle has a gap junctions that allow it to?
Act as a functional syncytium
Compared to skeletal muscle, cardiac muscle has a gap junctions that allow it to?
Act as a functional syncytium
Blood flows passively through the artia and the open AV valves into the ventricles during the period of ___________.
ventricular filling
The second heart sound is heard during which phase of the cardiac cycle?
isovolumetric relaxation
The _________ is the most hazardous time of the day for heart attacks.
morning
If we artificially made the pacemaker more permeable to sodium, what would happen.
threshold is reached more quickly and heart rate would increase
Cardiac Out-put: A slow heart rate _________ end dialostic volume, stroke volume, and force of _________.
Increases; contraction
Cardiac Out-put: A slow heart rate _________ end dialostic volume, stroke volume, and force of _________.
Increases; contraction
Some calcium enters the cell from the extracellular space and triggers calcium to release from intracellular space, what is this caused by?
Contraction of heart muscles
The short period during ventricular systole when ventricles are completely closed chambers is called?
Isovolumetric contraction
The short period during ventricular systole when ventricles are completely closed chambers is called?
Isovolumetric contraction
Commotio cordis is heart failure due to what?
mild blow to the chest during vulnerable interval when heart is repolarizing
