Alveolar cell Cell of the air sac of the lung

alveolar macrophage Macrophage found in lung and that can be obtained by lung lavage; responsible for clearance of inhaled particles and lung surfactant. Metabolism slightly different from peritoneal macrophages (more oxidative metabolism), often have multivesi-cular bodies that may represent residual undigested lung surfactant.

Alzheimer's disease A presenile dementia characterized cellularly by the appearance of unusual helical protein filaments in nerve cells (neurofibrillary tangles) and by degeneration in cortical regions of brain, especially frontal and temporal lobes. See also senile plaques.

amacrine cell A class of neuron of the middle layer of the retina, with processes parallel to the plane of the retina. They are thought to be involved in image processing.

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