CCI practice exam from ESP, Questions and answers. Rated A.
At what time during fetal growth is the heart first fully developed? - 40 Days
On the 30th day, the truncus normally divides. What anomaly occurs if the truncus does not divide? - truncus arteriosus
The sinus venosus forms: - co...
CCI practice exam from ESP, Questions
and answers. Rated A.
At what time during fetal growth is the heart first fully developed? - ✔✔40 Days
On the 30th day, the truncus normally divides. What anomaly occurs if the truncus does not divide? -
✔✔truncus arteriosus
The sinus venosus forms: - ✔✔coronary sinus, right atrium and inferior vena cava
The truncus arteriosus forms: - ✔✔carotid artery, pulmonary arteries and ductus arteriosus
What are the two right-to-left shunts in the normal fetal circulation? - ✔✔foramen ovale and ductus
arteriosus
Which of the following left-to-right shunts is the last to close in the normal post-partum period? -
✔✔patent foramen ovale, close at the end of the first week
In the normal fetal circulation, which of the following has the least amount of blood flow? -
✔✔pulmonary veins
What hemodynamic events occur post-delivery? - ✔✔pulmonary artery blood flow increases,
pulmonary resistance decreases, and foramen ovale flow decreases
The fetal ductus arteriosus closes soon after birth. What structure does it become? - ✔✔ligamentum
arteriosum
The ductus arteriosus connects the pulmonary artery and aorta in the fetus. At what site does the
ductus attach to the aorta? - ✔✔aortic isthmus
, The following 5 structures are activated during a single cardiac cycle. Rank them in the normal order of
activation:
Bundle of His, purkinje fibers, AV node, SA node and left bundle branch - ✔✔SA node, AV node, bundle
of His, left bundle branch, purkinje fibers
Which of the following structures is the primary pacemaker of the heart? - ✔✔SA node
During the resting state, which ions are pumped out of the cells of the myocardium? - ✔✔sodium
Following electrical depolarization of the myocardial cell membrane, which ion rushes in first and which
ion rushes in later? - ✔✔sodium followed by calcuim
Which ions help to slow heart muscle contractions? - ✔✔potassium
In the cardiac cell action potential, what phases are included in the absolute refractory period? -
✔✔phase 1 into phase 3
When contracting against which of the following pressures will the velocity of muscle cell contraction be
most rapid?
a. 75 mmHG
b. 100 mmHg
c. 125 mmHg
d. 150 mmHg - ✔✔75 mmHg
What happens to the beat following a premature ventricular contraction? - ✔✔The beat is stronger than
a typical beat
What is the Frank-Starling Law? - ✔✔The more heart muscle is stretched, the more forcefully it
contracts
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