Which of the Following Is a Benefit Provided by Fetal

question 103

Multiple Choice

Which of the following is a benefit provided by fetal hemoglobin?

• A) It transfers O₂ from adult hemoglobin to the fetus.
• B) It releases O₂ at a lower partial pressure than adult hemoglobin does.
• C) In the placenta, O₂ diffuses from adult hemoglobin to fetal hemoglobin.
• D) At low O₂ pressures, it is less likely to pick up oxygen than adult hemoglobin is.
• E) It occurs in higher density in red blood cells than adult hemoglobin does.

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Definitions:

Ventricle

One of the two lower chambers of the heart that receive blood from the atria and pump it out to the lungs or the rest of the body.

Cardiac Cycle

The series of events that occur from the beginning of one heartbeat to the beginning of the next, including systole (contraction of the heart muscle) and diastole (relaxation of the heart muscle).

Atrial Repolarization

The part of the cardiac cycle in which the atria return to their resting state by the re-entry of potassium ions into the cells, often masked by ventricular depolarization on an ECG.

Systole

The phase of the cardiac cycle when the heart contracts, pumping blood out of the ventricles and into the systemic circulation.