Divide the decimals. 18.4 ÷ 2.2 =

Which of the following is the most likely diagnosis in the newborn with severe cyanosis at birth?

a. Persistent pulmonary hypertension b. Tetralogy of Fallot c. Transposition of the great vessels d. Ventricular septal defect

The atria are separated from each other by a walled membrane known as the _______________ _______________. 

Fill in the blank(s) with the appropriate word(s).