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Ch. 21 Heart

BMS 307: Anatomy

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
Created by: taj1001