3 Cell structure - Biology141 (Physiology) 4/6/08 1:00 AM...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
4/6/08 1:00 AM Biology141 (Physiology) Page 1 of 4 https://courses.bio.psu.edu/spring2008/biol141/Lecture%203(2008).htm Biology141 (Physiology) Lecture 3 M. Whim CELL STRUCTURE [1]. BACKGROUND. this lecture is a review of the major organelles found in a typical cell. a cell is divided into 3 principal parts: The cell membrane. The cytoplasm and organelles. The nucleus. [2]. PLASMA MEMBRANE (cell membrane). a semi-permeable barrier prevents loss of enzymes, and other water soluble compounds. the barrier can’t be water soluble. It is composed of: 1. Phospholipids (see lecture 2). These have a hydrophilic head and hydrophobic tails. This leads to a double layer of phospholipids with the heads facing the cytoplasm and the extracellular environment. 2. Proteins: integral proteins span the membrane, e.g? peripheral proteins are partly embedded in either side of the membrane, e.g.? the fluid-mosaic model of the cell membrane. So-called because? membrane proteins include receptors (both for endogenous and exogenous molecules), transporters and enzymes. parts of the plasma membrane can be specialized for absorption, movement and sensory processes: (a). Cilia . projections of the plasma membrane that move in unison.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/05/2008 for the course BIOL 141 taught by Professor Viti,janehartwel during the Spring '08 term at Pennsylvania State University, University Park.

Page1 / 4

3 Cell structure - Biology141 (Physiology) 4/6/08 1:00 AM...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online