Heart Flashcards
Pulmonary circuit
The path blood takes from the heart to the lungs and back to get oxygen
Systematic circuit
The path blood takes from the heart to the REST of the body and back to deliver oxygen
Pericardium
A sac that surrounds and protects the heart
Parietal pericardium
The outermost layer of the pericardium that lines the chest cavity
Visceral pericardium
Innermost layer of the pericardium that covers the heart
Pericardial fluid
Acts as a shock absorber and reduces friction for the heart
The heart wall is mostly composed of —————, heart muscle.
Myocardium of right ventricle
Endocardium
Inner lining of the heart
What is the location of the heart?
————-:between the lungs
Mediastinum
What’s the function of the right/blue side of the heart?
Pumps O2 poor blood to lungs
Left/red
Pumps O2 RICH blood to the body
Interatrial septum
Separates the two atria
Atrioventricular valve
Found between the atria
Semilunar valves
Found between the ventricles and valves that exit the heart and pulmonary trunk
Pulmonary semilunar valve
Found between right ventricle and pulmonary trunk (prevents O2 poor blood found in the pulmonary trunk flowing back into the right ventricle)
Aortic semilunar valve
Found between the left ventricle and aorta
Artery
Carries (O2 rich) blood AWAY from the heart
Veins
Carries (O2 poor) blood TO the heart
Inner part of a vein or artery is called?
Tuna interna
Middle part of a vein or artery
Tunica media
Capillaries
Blood vessels that connect arteries and veins and are sued for gas exchange
During the ——————-, an action potential is created and transmitted, and it stimulates the contraction of the atria and ventricles.
Cardiac conduction system
What has properties of both muscle and nervous tissue
Nodal tissue
Pace maker cells, located in the right atria, spontaneously generates an electrical impulse which senses the heart rate of the heart
Sinoatrial Node
Atrioventricular bundle
Travels though the intro ventricular septum and up the walls of the heart
P-wave
Represents the depolarization of the atria and results in atria contracting
QRS complex
Represents the depolarization of the ventricle and realist in the ventricle contracting
T-wave
Represents REPOLARIZATION of the ventricles and is when the ventricles are relaxing
Contractions of the myocardium
Systole
Relaxation of the myocardium
Diastole
The 1st sound you hear is due to the ——————- valve closing and is called ————
Atrioventricualr valve
LUB
The 2nd heart sound is due to the ———— valve closing and is called ———-
Semilunar valve
DUB
Cardiac output
The volume of blood pumped out of a ventricle in one minute
To determine cardiac output
Heart rate x stroke volume
