With pertussis disease, thick mucus blocks the airways.

Under certain conditions, stem cells can transform into specialized cells, such as heart muscle, through a process called:

A) Assimilation. B) Differentiation. C) Proliferation. D) Propagation.

A 2-week-old infant who presents with poor feeding, fatigue, dyspnea, and a murmur is diag-nosed with a patent ductus arteriosus (PDA). This condition results in a(n):

a. decreased pulmonary blood flow. b. right-to-left shunt. c. left-to-right shunt. d. increased systemic blood flow.