Examlex
Vitamins can be grouped into two broad categories:
Receptor Proteins
Proteins that respond to specific chemical signals by inducing cellular response.
Protein Pumps
Integral membrane proteins that actively transport ions or molecules across cellular membranes, often against their concentration gradient, using energy.
Macrophages
Large phagocytic cells that can ingest and digest pathogens, cellular debris, and foreign substances, important in the immune response.
Phagocytosis
Process by which cells engulf large substances, forming an intracellular vacuole.
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