Cardiostimulatory effects of the cardiac center are transmitted to the heart via fibers of the _______ branch of the automatic nervous system
carries blood to the lungs for gas exchange and returns t to the heart
supplies blood to every organ of the body including other parts of the lungs and the wall of the heart itself.
outermost layer of the heart wall, has a layer of epithelial tissue and loose connective tissue
a simple squamous epithelium called endothelium. Smooth muscle so the blood can flow through
right and left atria
thin walled receiving chambers for blood returning to the heart by the way of the great veins
In a healthy person at rest, the_____ node normally fires about 75 times per minute setting the heart
provides structural support for the heart preventing the valves and great vessels from excessively stretching when blood surges through them
nonconductor of electricity, a electrical insulation between the atria and the ventricles so the atria cannot stimulate the ventricles directly
encircles the heart near the base and separates the atria above the ventricles below
coronary (atrioventricular) sulcus
a valve which consists of 2 or 3 fibrous flaps of tissue which are covered in endocardium
semilunar valve/ (pulmonary and aortic valve)
regulate the flow of blood from the ventricles into the great arteries
When ventricles contract , blood surging against the ____________ valves forces them closed.
atrioventricular Valve the (AV)
The artery that exist the aorta, travels under the left auricle and the divides them into the two branches is the left __________ artery
the opening and closing of the heart are governed by changes in ______ within heart chambers
Parasympathetic nerve fibers transmit ___________ effects from the cardiac center of the heart
The heartbeat is described as __________ because the signal for contraction originates in the heart muscle itself.
the difference between maximum cardiac output and resting cardiac output is referred to as the cardiac
The _____________________ artery branches out to the left coronary artery that continues around to the back of the heart in the coronary sulcus
The amount of tension in the ventricular myocardium immediately before it begins to contract
The groove that extends downward to the from the coronary sulcus on the front of the heart is the anterior ____________ sulcus
The opening and closing of heart valves are governed by changes in _______ within the heart chamber
During which phase of the cardiac cycle does the blood flow through the coronary circulation
A region of spontaneous firing of the conduction system system of the heart other than the SA or NA node
The left _________ vein is the blood vessel that collects venous drainage from the apex and the left of the heart.
Abnormal effects of the interatrial or interventricular walls resulting in abnormal blood flow though the heart
The cardiac nerves convey signals from the __________ nervous system, a autnomic nervous system to the heart
The condition called ____________ involves compression of the heart by abnormal accumulation of the fluid or clotted blood in the parietal cavity