ESS 205 Anatomy and Physiology Lecture 5 Outline of Last Lecture I. Permeability of Plasma Membranea. Two classificationsII.Passive TransportIII.Active TransportIV. Carrier MediatedV. Non Carrier MediatedOutline of Current Lecture VI. The study of tissuesVII.Features of tissue classesVIII.Types of tissue sections/planesIX. Epithelial Tissuesa. 4 Simple Classes of Epithelial tissuesCurrent Lecture1. The human has over 200 different cell types. There are four primary tissue classes which are epithelial, connective, muscular, and nervous. In this lecture, Epithelial is the only class covered. The study of tissues and how they form organs is called Histology. An organ is composed of two or more tissue classes. 2. Tissues are a group of similar cells, cell products, and a matrix. Tissues actually arose from the same region as embryos although most have a hard time relating the two. The differences between tissue classes are the types and functions, the characteristics of the matrix, and the amount of space occupied by the cell vs the matrix. The matrix is the extracellular material outside the cell. 3. A longitudinal section of tissues is where the tissues is cut along the longest direction of the organ. A cross section is cutting the tissue perpendicular to the length of the organ. An oblique section is cutting the tissue at an angle between the longitudinal and cross sections. 4. Epithelial tissues are skin tissues. There are one or more layers that adhere closely to other epithelial cells. It forms a flat sheet where there is no room for blood vessels. Because of this, the connective tissues underneath provide the blood flow for the These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.epithelial tissues. Epithelial tissues sit on the basement membrane (the basal surface of cells.) This basement membrane has a thin layer of collagen and adhesive proteins that anchor the epithelial tissue to the connective tissue.5. There are two different kinds of epithelial tissue; simple or stratified. Simple means one layer whereas stratified means more than one layer. 6. The first four of the simple epithelial tissues is the Simple Squamous. It allows rapid diffusion and secretes a serous fluid. It acts as a filtration membrane. These are primarilyin the kidneys.7. The second is Simple Cuboidal. These cube shaped cells allow absorption and secretion. They are present in the liver, kidneys, thyroid, and glands. 8. Third is Simple Columnar. Once again absorption and secretion is its primary purpose butthis also secretes mucus. It is located in the GI tract, uterus and kidneys. 9. Lastly, is Pseudostratified Columnar. This name is misleading. Pseudo means fake and stratified means more than one layer. So it is really fake stratified Columnar. It secretes and propels respiratory mucus. These columnar cells do not always reach the free surface. That is why it gets confused with being stratified. **keep in mind that simple just means one layer! It does not mean that it is not important. These are some of the MOST important****Also note that all epithelial cells absorb and secrete! It is just the location and shape that you need to focus