Vesicular Transport ( Endocytosis & Exocystosis)

What is vesicular transport?

Transport of materials across membranes using vesicles

What is endocytosis vs exocytosis

Endocytosis brings materials into the cell; exocytosis releases materials out of the cell

What are the three types of endocytosis

Phagocytosis, pinocytosis, and receptor-mediated endocytosis

Describe phagocytosis

“Cell eating” the membrane forms pseudopodia to engulf large particles (eg bacteria), forming a phagosome that fuses either lysosomes

Describe pinocytosis

“Cell drinking” - nonspecific uptake of extracellular fluid and solutes via membrane indentation forming endocytic vesicles

What is receptor mediated endocytosis

Specific uptake using receptors and Clathrin coated pits that concentrate ligands for entry

What is the role of clathrin in receptor mediated endocytosis

Cytoplasmic protein that coats vesicles, aiding in vesicle formation and receptor clustering

What are the key functions of exocytosis

Secretion of substances (eg hormones) waste release, and addition of membrane components (lipids, proteins)