heart Flashcards
what is the protective covering of the heart that surronds the heart and attches the roots of the great vessels
pericardium
what is the outer sac like layer of the pericardium
fibrous pericardium
the serous layer that lines the fibrous pericardium
parietal serous membrane
a serous layer that adheres directly to the myocardium and covers the root of the eight great vessels
visecreal serous pericardium
where is the pericardial cavity and what purpose does it serve
it lies between the visceral and parietal layers of the serous pericardium. it secretes a thin layer of fluid that reduces friction as the heart beats
the apex of the heart is located on the level of the ___ intercostal space
5th
the diaphragmatic space is formed by mostly what part of the heart?
left ventricle
the right and left surfaces of the heart are primarly formed by the _______ and ________
right atrium and left ventricle
the atriums are seperated from the ventricles by the
coronary sinus
what seperates the two ventricles
anterior and posterior interventricular sulci
what type of blood does the right atrium recieve and how does it recieve it
recieves blood low in oxygen and high in carbon-dioxide. it recieves it through the superior and inferior vena cavae and coronary sinus
valves at the opening of the opening of the coronary sinus and inferior vena cavae
rudimentary valves
what is the function of the auricle
increases internal surface area of the right atrium
what seperates the right atrium from the left
interatrial septum
what is the purpose of the fossa ovale
fetal opening between left and right atria that shunted blood across the heart to avoid the pulmonary circuit
the fossa ovalis is typically larger in the left or right atrium
right
blood flows from the right atrium to the __________ through the __________
right ventricle, tricupid valve
what are the three cusps of the triscupid valve
septal, anterior, and posterior
what type of blood does the right ventricle recieve and where does it recieve it from
blood that is low in oxygen and high in carbon dioxide from the right atrium (through the triscupid valve)
what is the trabeculum that extends freely from the interventricular septum
septomarginal trabecula (moderator band)
what does the moderator band contain
branch of the atrioventricular (AV) bundle
what is the valve at the exit of the right atrium called
pulmonary semilunar valve
what are the pulmonary valve cusps called
right, left, anterior
what is the purpose of valves and how do they work
valves prevent a backflow of blood from entering back into the atriums. the blood pushes its way through the valve going from an area of high pressure to low pressure
the left atrium recieves what type of blood and from where
blood high in oxygen and low in carbon dioxide. it recieves it from the pulmonary veins (coming from the lungs)
the left ventricle recieves the blood from where and what type of blood
the high oxygen and low in carbon dioxide blood goes through the biscupid valve (of the left atrium) into the left ventricle
what are the two cusps of the biscupid valve
anterior and posterior