b) Phagocytes : A form of endocytosis in which the cell engulfs large solid particles, such as worn out cells, whole bacteria, or viruses. Two main types include: Macrophages and Neutrophils (WBC). This is a vital defense mechanism protecting the body from disease. c) Pinocytosis (Bulk-Phase Endocytosis) : A form of endocytosis in which tiny droplets of extracellular fluid are taken in. Results in smaller molecules such as AAs and FAs to be used elsewhere in the cell.
ii) Exocytosis: Substances are transported out of the cell. Examples include secretory cells that liberate digestive enzymes, hormones, mucus, or other secretions. Nerve Cells are another example that release Neurotransmitters.
iii) Transcytosis: Substances are transported into a cell on one side, and out of a cell on the other side. Said another way: Endocytosis on one side of the cell, and exocytosis on the other side of the cell.
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