histogen. n. 1. (Botany) (formerly) any of three layers in an apical meristem that were thought to give rise to the different parts of the plant: the apical meristem is now regarded as comprising two layers. See corpus, tunica.a Regenerative Medicine company) and is on the Surgical Faculty for the Procedural Dermatology Fellowship at the University of California at Irvine, Dermatology Faculty, Western University/Pacific Hospital, Long Beach, California and Michigan State University, Dermatology Faculty.
People with fluid in the lungs will experience the following signs and symptoms. 1  Fatigue. 2  Breathing difficulties. 3  Weakness. Cough. 4  Grunting. Pale 5  skin. Restlessness.  Excessive sweating.
This can cause problems with the exchange of gas (oxygen and carbon dioxide), resulting in breathing difficulty and poor oxygenation of blood. Sometimes, this can be referred to as water in the lungs when describing the condition to patients. Pulmonary edema can be caused by many different factors.