Muscular organ divided into four chambers; its regular rhythmic contractions cause blood to circulate throughout the organism.
Smooth thin inner casing of the heart attached to the myocardium.
Thick muscular casing around the heart; its contraction is involuntary and depends on the autonomous nervous system.
inferior vena cava
Vein carrying blood deoxygenated in the lower portion of the body (below the diaphragm) to the right atrium; it is the largest vein in the organism.
arch of aorta
Second segment of the aorta, which branches into the arteries flowing to the head and upper limbs; with the ascending aorta, it forms the arch of the aorta.
superior vena cava
Vein carrying deoxygenated blood from the upper body (above the diaphragm) back to the right atrium.
right pulmonary vein
Each of two veins returning blood oxygenated in the right lung to the left atrium of the heart.
Membranous fold made up of three walls; it carries blood from the right atrium to the right ventricle and prevents its reflux.
Main artery of the body that originates in the left ventricle of the heart and is made up of four segments; it distributes oxygenated blood throughout the body.
Thin-walled heart cavity receiving deoxygenated blood from the right atrium; it then forces it into the pulmonary artery leading to the lungs.
Internal ventricular muscle restraining the mitral or tricuspid valve and preventing it from being pushed back into the atrium during contraction of the ventricle.
Mostly muscular partition separating the right and left ventricles of the heart.
Thick-walled heart cavity receiving oxygenated blood from the left atrium; it then forces it into the aorta to circulate throughout the organism.
Membranous fold made up of two walls; it carries blood from the left atrium to the left ventricle and prevents its reflux.
Membranous fold made up of three walls; it carries blood from the left ventricle to the aorta and prevents its reflux.
left pulmonary vein
Each of two veins returning blood, oxygenated in the left lung, to the left atrium of the heart.
Heart cavity receiving oxygenated blood from the lungs via four pulmonary veins; it then forces it into the left ventricle.
Membranous fold made up of three walls; it carries blood from the right ventricle to the pulmonary artery and prevents its reflux.
Artery carrying blood that is poor in oxygen and rich in carbon dioxide to the lungs; this is the only artery that transports oxygen-poor blood.
Heart cavity receiving deoxygenated blood from the lower and upper venae cavae; it then forces it into the right ventricle.
Blood whose oxygen is depleted; the veins carry it to the right portion of the heart, after which it is re-oxygenated in the lungs.
Blood enriched with oxygen in the lungs; it leaves the left section of the heart and flows through the arteries to distribute oxygen and nutrients to the organism.