Describe the following types of transport processes in cells. simple diffusion, facilitated diffusion, active transport pinocytosis, receptor- mediated endocytosis, phagocytosis and exocytosis

Simple diffusion is a passive transport process where small, non-polar molecules move through the cell membrane down their concentration gradient. Facilitated diffusion involves larger, charged or polar molecules moving across the cell membrane with the help of transport proteins. Active transport requires energy to move molecules against their concentration gradient using specialized transport proteins. Pinocytosis, "cell drinking," involves cells engulfing extracellular fluid containing solutes through small vesicles. Receptor-mediated endocytosis selectively transports specific molecules via ligands binding to cell-surface receptors and forming vesicles. Phagocytosis, "cell eating," involves engulfing large solid particles and forming a phagosome for enzymatic degradation. Exocytosis secretes substances like hormones, neurotransmitters, or waste products through vesicle fusion with the cell membrane, maintaining cellular homeostasis and communication.