HBS101 Lecture Notes - Lecture 2: Endoplasmic Reticulum, Lipid Bilayer, Facilitated Diffusion
Document Summary
Hba week 2 cell structure & function. The major structures of the cell & their function. Cytoplasm - a combination of both the cytosol and the cell"s organelles. Cytosol is also known as the fluid portion of the cytoplasm. Organelles are the specialised structures that have specific shapes and perform specific functions. Endoplasmic reticulum - rough er: proteins and glycoproteins. The basic structure and function of the plasma membrane. The plasma membrane is a flexible yet sturdy barrier that surrounds and contains the cytoplasm of the cell. Its function is to protect the cell from its surroundings and it regulates the movement of substances in and out of cells. Phospholipid bilayer: composed of hydrophilic head and hydrophobic tail. Membrane permeability: plasma membranes are selectively permeable, the lipid bilayer is always permeable to small, nonpolar, uncharged molecules, transmembrane proteins that act as channels or transporters increase the permeability of the membrane. Transport across the plasma membrane: membrane are:
