A limb presentation occurs when the baby's arm, leg, or foot is emerging from the vagina first.

Which of the following is the normal (average) pulse rate for a preschooler?

a. 60 to 100 b. 75 to 120 c. 80 to 140 d. 90 to 150

Which of the following changes occurs in the respiratory system of a pregnant woman?

A) Progesterone increases the threshold of the medullary respiratory center to carbon dioxide. B) Minute ventilation increases by as much as 50%, which causes the PaCO2 to drop by about 5 mm Hg. C) Oxygen consumption decreases by approximately 20%, causing a 40% decrease in tidal volume. D) An increase in blood bicarbonate levels causes a slight decrease in the pH level of the blood.