BI110 Lecture Notes - Lecture 15: Exocytosis, Nuclear Membrane, Cytosol
Document Summary
A series of interconnected organelles, that communicate with one another. Separation into 2 compartments: the area within these organelles and the area outside these organelles. Exocytosis = the secretion of vesicle contents into the extracellular space by fusing with the plasma membrane. Endocytosis = brings material from outside the cell into a vesicle that can then fuse w/ organelles. Vesicles = membrane enclosed sacs that transport substances in cells. Nuclear envolope = defines the boundary of the nucleus, containing an inner and outer membrane. Perforated (peirce and make holes in) by membrane protein openings. Small molec and ions can passively diffuse through the pores, but large proteins and rna require active transport. Nuclear pores = allow molecules (ex. mrna) to move into and out of the nucleus. Essential for the nucleus to communicate with the rest of the cell. The outer membrane of the nuclear envelope is continuous of. It is a network of interconnected tubules + flattened sacs.
