Respiratory Distress Syndrome. Respiratory distress syndrome of the newborn, also called hyaline membrane disease, is the most common cause of respiratory distress in premature infants, correlating with structural and functional lung immaturity. The pathophysiology is complex.
Orange juice with pulp is a heterogeneous mixture. The pulp is not uniformly distributed throughout the juice, often settling at the bottom of the jug, resulting in regions with distinctly different properties.
Heterogeneous is a term used with mixtures and the way I like to think about it is: If you have cheerios, apple jacks, and coco puffs in a bowl you have a heterogeneous mixture because you can physically separate the cereals from each other. If you can not physically separate out the components, it is not a mixture.