Heart Structure
The upper two chambers of the heart
Atria
Coronary arteries supply blood to the...
Heart
The electrical impulse that initiates contraction starts here.
SA node
This part of the ECG represents atrial depolarization
P wave
Vasodilation
This valve prevents blood from flowing back to the right ventricle
Pulmonary valve
Gas exchange happens at these blood vessels
Capillaries
During this phase of the cardiac cycle, the atria are relaxed and filling with blood.
Atrial diastole.
The QRS complex represents...
Ventricular depolarization
If heart rate increases, blood pressure will...
Increase
This is the largest artery in the body
Aorta
These are the only arteries that blood is deoxygenated
During this phase of the cardiac cycle, ventricles contract and blood is pumped to the pulmonary arteries and aorta
An elevated ST segment is an indicator of...
A heart attack
If temperature increases, heart rate will...
Increase
This brings deoxygenated blood to the right atrium
Vena cava
After blood passes the tricuspid valve, it enters the...
right ventricle
The ventricles contract when the electrical impulse reaches the...
Purkinje fibers
This represents the time it takes for the electric impulse to go from the SA node to the AV node
PR interval
These receptors detect changes in blood pressure and are located on the aortic arch
Baroreceptors
This valve is between the left atrium and the left ventricle
Bicuspid (Mitral) valve
After being oxygenated by the lungs, blood will enter the heart through this structure.
Pulmonary veins
The AV valves and the semilunar valves are closed during these two phases.
Isovolumetric relaxation and isovolumetric contraction
Atrial depolarization happens during the...
QRS complex
The cardiac control center sends impulses to this part of the conduction system to increase or decrease heart rate
SA node