heart Flashcards
(21 cards)
right atrium
the right upper chamber of the heart. it receives deoxygenated blood from the body through the vena cava and pumps it into the right ventricle, which then sends it to the lungs to be oxygenated. located on the lower right back side of the heart, one of the four chambers
vena cava
a large vein carrying deoxygenated blood into the heart. there are two in humans, the inferior vena cava and the superior vena cava
inferior vena cava
aka posterior vena cava. a large vein that carries de-oxygenated blood from the lower body to the heart.
deoxgenated blood
most of the oxygen has been removed by tissues, and therefore the blood is darker
inferior vena cava job
collects blood from veins, serving the tissues inferior the heart and returns this blood to the right atrium of the heart
inferior vena cava is
very large in diameter, its walls are incredibly thin due to the low pressure exerted by venous blood
superior vena cava
is a large diameter, yet short, vein that carries deoxygenated blood from the upper half of the body to the heart’s right atrium. It is located in the anterior right superior mediastinum
heart
is the size of a fist, located behind and slightly left of the breastbone, has four chambers: right atrium, right ventricle, left atrium, left ventricle
right ventricle
responsible for pumping oxygen-depleted blood to the lungs. locate in the lower right portion of the heart, below the right atrium and opposite the left ventricle. one of the four chambers
left ventricle
one of the four chambers,largest and stronget chamber located in the bottom left portion of the heart, below the left atrium
left ventricle receives
receives oxygenated blood from the left atrium via the mitral valve and pumps it through the aorta via the aortic valve, into the systemic circulation.
left atrium
one of the 4 chambers, located on the left posterior sde
aorta
the largest artery in the body, It is about the diameter of your thumb and about a foot long. This vessel carries oxygen-rich blood from the left ventricle to the various parts of the body. has 4 divisions: ascending aorta, aortic arch, descending thoracic aorta, abdominal aorta
ascending aorta
rises up from the heart and is about 2 inches long. The coronary arteries branch off the ascending aorta to supply the heart with blood.
aortic arch
curves over the heart, giving rise to branches that bring blood to the head, neck, and arms.
descending thoracic aorta
travels down through the chest. Its small branches supply blood to the ribs and some chest structures.
abdominal aorta
begins at the diaphragm, splitting to become the paired iliac arteries in the lower abdomen. Most of the major organs receive blood from branches of the abdominal aorta.
aorta layers
several layers: The intima,The media,The adventitia
The adventitia
the outer layer, provides additional support and structure to the aorta.
the media
the middle layer with muscle and elastic fibers, allows the aorta to expand and contract with each heartbeat.
the intima
the innermost layer, provides a smooth surface for blood to flow across.
