If the left ventricle fills with 85 mL of blood and ejects 60 mL during a contraction, the ejection fraction is approximately ___%.

The amount of blood pumped by the heart in one minute is referred to as:

A) cardiac output. B) blood pressure. C) preload. D) stroke volume.

Which vessels transports oxygenated blood and nutrients from the placenta to the fetus?

a. umbilical artery c. placental artery b. umbilical vein d. placental vein