The Living World 8th Edition by George Johnson

تمرين 16

An ECG measures
A) changes in electrical potential during the cardiac cycle.
B) Ca 2+ concentration o the ventricles in diastole.
C) the force of contraction of the atria during systole.
D) the volume of blood being pumped during the contraction cycle.
Some babies, called "blue babies," are born with a small hole in the wall between their heart's left and right ventricles. Why do you suppose they are called "blue"? (Hint: How might this hole affect the oxygen content of the blood being pumped out into the body's general circulation by the baby's heart?)