Exam 21: Development and Aging

Match the special structures of the fetal cardiovascular system with their descriptions. -shunt between the pulmonary artery and the aorta that causes most of the blood to bypass the lungs

The spontaneous ending of a pregnancy that results in the premature expulsion of the embryo is termed a(n) ________.

The development of an embryo involves four processes. Match each process to its description. -cells increase in number and size

Following fertilization, if a ball of embryonic cells splits into two masses before differentiation has begun, ________ twins result.