A transport across the cell membrane in which no energy is used.
Passive Immunity
An immunity in which the body is not actively manufacturing antibodies.
Parturition
The process of labor and delivery of a baby.
Pars Reticularis
The deeper layer of the dermis that contains dense, irregular connective tissue; the reticular layer.
Pars Papillaris
Superficial dermis layer that has loose connective tissue; the papillary layer.
Parotid Gland
A salivary gland that lies anterior to the ears.
Parietal Pleura
The layer of the pleural membrane that lines the inside of the thorax.
Parietal Pericardium
The part of the pericardium that is outside the visceral pericardium.