blood returns to the fetus from the placenta via the……..
it is ……..% saturated with Oxygen
Blood from the umbilical vein bypasses the liver via the……and flows to the inferior vena cava
most of the blood from the inferior vena cava passes through the right atrium to the left atrium via the ……
some of the blood from the IVC mixes with…….. blood in the right atrium
After blood leaves the right ventricle and heads to the pulmonary trunk, instead of going to the lungs via pulmonary arteries, majority of it heads towards the arch of the aorta via the
Blood heads down the descending aorta and returns to the placenta by way of two ……
at this point the blood is …….% saturated with O2.
Upon an infants first breath two important things happen. The first breath inflates the lungs. The change in pressure in the thorax causes…… This forces the foramen ovale shut.
blood pressure change in RIGHT atrium ( falls lower than left atrium).
Other circulatory changes that happen: fetal structures become ligaments.
The ductus arteriosus becomes……
The umbilical arteries close and form the …..
medial umbilical ligaments and superior vesical arteries.
The umbilical vein closes and forms the
ligamentum teres hepatis (round ligament of the liver).
The ductus venosus closes and forms the
The heart borders on the left side are:
ribs 2-5 INTERCOSTAL spaces @ midclavicular line
The heart borders on the right side are :
ribs 3-6 at costal cartilage
what sounds are you listening for when performing a heart auscultation (4 locations)
Listening to the : Aortic valve, pulmonary valve, tricuspid, and mitral
The first branch off the aorta to the heart is the…
Left coronary artery ( most common place of occlusion)
What distinguishes a right dominant heart from a left dominant heart?
a right dominant heart has the posterior inter ventricular artery coming off the right coronary artery.
a left dominant heart has the posterior inter ventricular artery coming from an enlarged branch of the left circumflex artery.
the cardiac skeleton forms a ring around each four valves. It functions to maintain the shape of the valves, electrically isolates the atria from the ventricles, and
maintains attachment for the cusps of the valves
Does the heart need innervation from the nervous system to beat?
no! it has myocardial cells…not neural cells.
outside input from the nervous system is needed however for:
changing the rate or force of conduction