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50 terms

Beth Anderson's Extra Credit due on 3/26/10 on the heart

Beth Anderson's Extra Credit due on 3/26/10 on the heart
STUDY
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protects/anchors/prevents overfilling with blood
2 functions of fibrous pericardium
cardiology
the study of the normal heart and diseases associated with it
pericardial/mediastinum/thoracic
the heart is located in a ________ cavity, which is found in the ________ which is located within the _______ cavity
mediastinum
medial cavity space between the pleurae of the lungs that extends from the sternum to the vertebral column
2/3, left
approximately _____ of the hearts mass lies to the ______ of the mediasternal line
pericardium
the heart is enclosed in a double-walled sac called the what
fibrous pericardium
loose fitting superficial part of pericardium
serous pericardium
deep to fibrous pericardium; a thin, slippery, two-layer serous membrane
visceral layer
lines external heart surface
pericardial cavity
located between the two layers of serous pericardium, is filled with a thin layer of pericardial fluid
pericardial fluid
pericardial cavity is filled with what
reduce friction
function of pericardial fluid
epicardium
external layer of the heart
epicardium/myocardium/endocardium
list 3 layers of heart wall
endocardium
inner layer of heart wall
epicardium
visceral layer of serous pericardium
epicardium
smooth, slippery texture to outermost surface
95
_____% of heart is cardiac muscle
myocardium
layer of heart; cardiac muscle
endocardium
smooth lining for chambers of heart, valves, and continuous with the lining of large blood vessels
chambers of heart/valves/lining of blood vessels
where is endocardium found
4
how many chambers does the heart have
interatrial septum
the 2 atria are separated from each other by what
interventricular septum
the 2 ventricles are separated from each other by what
septum
a solid structure that separates two cavities
anterior interventricular sulcus
marks the anterior position of the septum separating right and left ventricles
posterior interventricular sulcus
provides similar landmarks as anterior interventricular sulcus on the posterior side
myocardium
the thickness of the ________ of the 4 chambers varies according to the function of each chamber
atria walls
are thin because they deliver blood to the ventricles
ventricle walls
are thinner because they pump blood greater distances
thinner, lungs
the right ventricle walls are _____ than the leaft because they pump blood into the _______, which are nearby and offer very little resistance to blood flow
thicker
the left ventricle walls are ______ because they pump blood through the body where the resistance to blood flow is greater
atria
the 2 upper chambers of the heart are called what
auricles
small earlike projections, extend anteriorly from the atria and help to increase atrial volume
interatrial septum
bears a shallow depression that marks the spot where the foramen ovale existed in the fetal heart
fossa ovalis
shallow depression on interatrial septum
foramen ovale
the fossa ovalis marks the spot where the _____ ______ existed in the fetal heart
reservoirs
atria function primarily as what
superior vena cava/inferior vena cava/coronary sinus
list 3 major veins entering the right atrium
superior vena cava
returns blood from the regions superior to the diaphragm
inferior vena cava
returns blood from regions below the diaphragm
coronary sinus
returns blood from the myocardium of the heart
tricuspid valve
blood flows through which valve from right atria to right ventricle
left atrium
forms most of the base of the heart
4 pulmonary veins
what returns blood from the lungs
bicuspid valve
valve between left atria and left ventricle
left atrioventricular, mitral, bicuspid
list 3 names of bicuspid valve
ventricles
the two lower chambers of the heart
left ventricle
dominates the hearts posterior inferior surface
ventricles
major pumping chambers of the heart