the circulation of the body as a whole bu separate from the pulmonary circulation
the venous side of the systemic circulation as it returns blood to the heart via the superior and inferior vena cavae
circulation from the heart to the lungs and back
system of veins (intercostals and hemizazygous veins) draining the thoracic wall converging on the azygous vein that drains into the superior vena cava
hepatic portal system
venous circulation from GI organ capillaries to the venous sinusoids of the liver via the portal vein and its branches
connections between the small branches of two larger arteries or veins
it provides for collateral circulation between them if one is occluded
end arteries have no anastomoses such as renal arteries or the central artery of the retina of the eye
enclosed serous sacs that line the body cavities
visceral pleura lines the lung surface
parietal pleura lines the body wall
the sac that surroudns the heart with visceral and parietal serous layers that reduce friction as the heart beats
has a fibrous pericardium on the outside and a serous inner layer
also known as the epicardium, the serous layer covering the fat/coronary vessels of the heart
compression of the heart from an abnormal collection of fluid in the pericardial cavity
fibrous pericardium has low compliance, so increased fluid accumulation increases pressure outside the heart
this restricts filling of the heart with blood
Describe the position of the heart in the thorax.
spans anterior ribs 2-6, the length of the body of the sternum
a horizontal plane through the ventricles is at vertebral body T7/T8
Describe the orientation of the heart in terms of its anterior, posterior boundaries as well as its right and left margins.
anterior - right ventricle
posterior - left atrium
right margin - right atrium
left margin - left ventricle
What parts of the lungs butt against the heart?
the middle lobe of the right lung and the lingula of the upper lobe of the left lung
Describe the bloodflow through the heart.
superior and inferior vena cava -> right atrium -> right atrio-ventricular (tricuspid) valve -> right ventricle -> pulmonary semilunar valve -> pulmonary trunk -> pulmonary arteries -> lungs -> pulmonary veins -> left atrium -> left atrio-ventricular (mitral or bicuspid) valve -> left ventricle -> aortic semilular valve -> aorta -> systemic circulation
crest between pectinate muscle and smooth posterior wall
it contains pacemaker tissue in addition to the sino-atrial node
remnant of the fetal foramen ovale, a blood shunt from right to left atrium
smooth top of the right ventricle tapering into the pulmonary semilunar valve
"fleshy little beans" of muscle lining most of the ventricles
specialized trabeculae stabilizing the atrioventricular valves via the chordae tendinae
prevents back swining of the vvalve cusps into the atria during ventricular systole
ridges between the smooth conus arteriosus and the trabecular wall below
a significant one is the moderator band from the interventricular septum to the papillary muscles
a structure of the left ventricle
the smooth upper part of the chamber equivalent to the conus arteriosus of the right ventricle
What prevents the semilunar valves from allowing backflow?
the blood-filled sinus between each valve cusp and arterial wall prevents the open valve cusps from sticking to the wall
Where is the best place to hear the aortic and pulmonary valves?
the 2nd intercostal space
Where is the best place to hear the tricuspid and mitral valves?
the 5th left intercostal space
Describe the arrangement of heart muscle and how this affects the contraction process.
the muscle layers are arranged in a spiral fashion, and contraction proceeds form the apex upwards, squeezing blood toward the AV valves like wringing a towel
What does the left coronary artery branch into?
anterior interventricular (LAD), circumflex, and left marginal branches
What heart structures does the left coronary artery supply?
most of the left atrium and ventricle
anterior part of the right ventricle adjacent to anterior interventricular artery
anterior 2/3 of the IV septum
AV bundle branches in the septum
What does the right coronary artery branch into?
marginal, nodal (right atrial), posterior interventricular (descending) branches
What heart structures do the right coronary artery supply?
most of the right atrium and ventricle
posterior part of the left ventricle adjacent to the posterior interventricular artery
posterior 1/3 of the IV septum
SA (60%) and AV (80%) nodes