Question | Answer |
Pulmonary Circuit | carries carbon dioxide rich blood from the heart to the gas-exchange surfaces of the lungs and returns oxygen rich blood to the heart |
systemic circuit | transports oxygen-rich blood from the heart to the rest of the body and returns carbon dioxide rich blood back to the heart |
Right Atrium | recieves blood from the systemic circuit via the superior and inferior vena cava |
Right Ventricle | discharges blood into the pulmonary circuit via the pulmonary artey |
Left Atrium | collects blood from the pulmonary circuit via the pulmonary veins |
Left Ventricle | ejects blood to the systemic circuit via the aorta |
Arteries | transports blood away from the heart |
Veins | returns blood to the neart |
Capillaries | small thin walled vessels that interconnect the smallest arties and veins. They permit exchange of nutrients, gases,and waste products. |
Pericardium | the serous membrane lining the pericardial cavity |
Pericardial Cavity | A portion of the ventral body cavity |
Visceral Pericardium | (epicardium) potion of the pericardium in contact with the heart |
Parietal Pericardium | the portion of the pericardium that is not in contact with the heart. |
endocardium | the inner surfaces of the heart made of simple squamous |
Cardiocyte | cardiac muscle cell |
Functional syncytium | when one cell contracts they will all contract |
Epicardium | the outer surface of the heart that is in contact with the visceral pericardium |
Location of the heart | slightly to the left of the midline, sitting at an oblique angle rotated slightly to the left |
Coronary Citculation | supplies blood to the muscle tissue of the heart |
Systole | Contracton of the heart- when a chamber ejects blood either into an artery or into another chamber |
Diastole | Relaxation of the heart- after a contraction when a chamber fills with blood |
Nodal Cells | responsible for establishing the rate of cardiac contraction |
conducting fibers | distribute the contractile stimulus to the general myocardium |
Pacemaker cells | rapidly depolarizing cells, located in the S.A node |
S.A Node(sinoatrial) | cardiac pacemaker, located in the posterior wall of the right atrium. Produces an impluse thst creates a heart beat |
A.V Node (artioventricular) | sits in the floor of the right atrium near the coronary sinus. Slows down the impulse before sending it through the AV Bundles |
Bundles of His | travels along the interventricular septum before separating into the right and left bundles. Carries the impluse towards the apex of the heart. |
Purkinje Cells(Fibers) | distribute the impluse to the papilary muslecs which tenses the chordae tendineae. Then contarction begins from the apex toward the top of the ventricles |
Tachycardia | a heart rate of more than 100 beats per minute |
Bradycardia | a heart rate of less than 50 beats per minute |
Tricuspid | The valve between the right atrium and right ventricle. Contain three flaps |
Bicuspid | The valve between the left atrium and the left ventricle. Contains two flaps |
Interventricular Septum | A thick muscular partition that divides the right and left ventricles |
Myocardium | Cardiac muscle tissue |